Sweet, so once I get this running, what would be the safe operating rpm range for an engine like this?

Just depends on what you want that 225 to do. It would be a good idea to tell us your plans. Race? Dalily Driver? Buget? Whats it going in?
Then we can supply you with some realist ideas.
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Daily driver. I'm aiming for an engine that has alot of low end power and not so much at the higher range. I think this engine will do nicely with a rebuild. Can someone tell me what it came from? Or what it will fit in? I'm not familiar with Chrysler vehicles and such.

Or is there a place where I can look up the cast number myself? I can't seem to find any place that will decode this funky number for me.

EDIT: I entered it into some form thingy and got:

Searched 1453 records for description term "225 t4 22e" and yielded 37 hits:

* 2 2240548 - Same as 2257159, Gas tank sending unit--62 Ply, Dod, Chry Sub
* 2 4120930 - chrome valve cover, non-OE RG 225 fits 1981-84
* 2 4104362 - cylinder head RG 198 225 1979-80 casting#
* 2 4095778 - cylinder head RG 198 225 1981-83 casting#
* 2 4071072 - engine block 1976-77 225 engine w/ cast crank casting#
* 2 4071060 - vibration damper RG engines 198 225 1976-77 casting#
* 2 4041994 - connecting rod 225 engine, cast crank casting#
* 2 4041314 - engine block 1976-77 225 engine w/ forged crank casting#
* 2 4104362 - intake manifold, RG-series 225 2bbl, super six, 1977-1980 casting#
* 2 4041043 - intake manifold, RG-series 225 2bbl, super six, 1977-1980 casting#
* 2 4095778 - cylinder head RG 225, hydraulic lifters 1980-1982 casting#
* 2 4104362 - cylinder head RG 225 1975-76 casting#
* 2 4027600 - cylinder head RG 225 1975-76 casting#
* 2 4027598 - cylinder head RG 225 1975-78 casting#
* 2 4001955 - k-member M-body 225 1979-83
* 2 4001847 - k-member F-body 225 1976-77
* 2 4001649 - k-member F-body 225 1976-77
* 2 3830099 - crankshaft 225 RG engine 1976-77 w/ forged crank casting#
* 2 3769672 - valve cover RG 225 1974-77
* 2 3751036 - crankshaft 225 RG engine 1976-77 w/ cast crank casting#
* 2 3698995 - cylinder head RG 198 225 1972-74, hardened exhaust valve seats casting#
* 2 3698447 - cylinder head RG 198 225 1975-78 casting#
* 2 3698444 - cylinder head RG 198 225 1975-78
* 2 3690742 - chrome valve cover, non-OE RG 225 fits 1960-80
* 2 3614850 - cylinder head RG 198 225 1971 emissions, hardened exhaust valve seats casting#
* 2 3462605 - engine block 1975 225 engine casting#
* 2 2951694 - engine block 198 225 engine casting#
* 2 2899582 - crankshaft 225 RG engine truck applications casting#
* 2 2899582 - crankshaft 225 RG engine 1968-1976 large pilot, passenger car casting#
* 2 2843169 - cylinder head G/RG 170 198 225, improved chamber design1968-1973 casting#
* 2 2843169 - cylinder head G/RG 170 198 225 1967 casting#
* 2 2806830 - engine block, RG-series 225 198, 1968-1970 casting#
* 2 2806211 - vibration damper G/RG engines 170 198 225 1960-1975 casting#
* 2 2463430 - engine block 1965 RG 225, 1960-67 casting#
* 2 2406657 - connecting rod 225 engine, forged crank casting#
* 2 2206035 - cylinder head G/RG 170 225 1964-66 casting#
* 2 2205554 - connecting rod, RG-series 225 1960-1980 casting#

If you go to the main page for this site you can get info on your casting numbers. While there look at some of the articles.
Have you decided what the engine is going in yet? I didnt see that posted.
A rebuild may get what you want or you may need more look at the engine matrix thread Agressive Ted has a good build from DD and he is still squalling tires with his 1 bbl carb.
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

I'd kinda like to put it in a Plymouth Duster eventually, but for now I gotta get it running. I gotta make a mount for the starter, buy/get a starter, and find an old alternator and battery, I think we have a radiator here too. That should be all that's needed to run the thing, right? Maybe find out what the hell everything does on the thing. I think it's just a single barrel carburettor. I hope I can find out what year it is so I can get a manual for it. Thank you for all of your help guys! I'll get it in running condition and post the results, get it nice and shiny, you know? =D

Sounds like fun. You will need a bell housing with flywheel or a 904 Auto transmission (either one will have to be for a slant 6) this is what the starter mounts on.
Most of the engine spefic areas of a service manual or the same on all of the slant 6's the only thing thats really changed was the polution control for that year and Hydrolic cam in the mid 80s(dont remember the year) Looks like your engine is 1967 or later. I would try a 74 Duster manual and use it as a good starting point.
Box Wrench has a engine vidieo out that really helps you out and is well worth the money.
You may not have to do too much to your engine as they can take a lot.
Good luck and use the search function to help you find specfic info.
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

I have the box wrench engine building dvd. Good idea on the bell housing part. I'll get that somewhere. Shouldn't be too hard to find. As long as the manual tells me where everything hooks up to on the engine I should be fine. Eventually I'm gonna rebuild it to make it more economical (if possible) and maybe a bit more powerful. Should be a fun project. I hear it's pretty impossible to ruin one of these engines, especially if it doesn't have any computer or EFI stuff. Can't wait to find an old Duster somewhere, someday. That would be my dream car lol. =D Room for lots of crap in the trunk, passengers, and a big engine bay! YaY!

Ive got a 75 Duster with a 225, I love it.

_________________
Ronnie
http://www.cardomain.com/ride/2714941

EDIT:
Oops, just saw your signature. Nice car! I'm putting a 225 in mine if I ever get one.

Yeah before I got my car it was sitting for like 10 years. And the 225 still runs as if it wasnt sitting at all.

_________________
Ronnie
http://www.cardomain.com/ride/2714941

lol I WANT YOUR CAR =D

If you ever decide to sell it for whatever insane reason, TELL ME!! Heh, I'd love to get one someday!! =)

What are you planning to do with it?

Just get the power and mpgs up a little, maybe in the summer get a super six setup. But I havent really decided yet. Just hang in there until you find one you like.

_________________
Ronnie
http://www.cardomain.com/ride/2714941

Woohoo. My grandpa as it turns out has a 1984 Dodge Ram with a slant six in it! I got the starter and alternator today, I'll have to wait for better weather in order to get the fuel pump. This is great, I have a slant six parts car now! Yes! Heh heh, also has a radiator! Can you say jackpot?