So I'm contemplating the big switch to a 318. Can anyone tell me whether I could take a small block (340 I guess) 727 and bolt it up to a 318 out of a '74 Dart Swinger? Does the 727 have similar shift linkage and stuff that would make it an easy replacement for a 904? Since a tranny swap would be required, I'd like to go straight to the strongest one in anticipation of any future engine mods.

SB 727 will bolt right up (and they came on 318s as well as 340s & 360s). Shift linkage should be the same; not sure about kickdown linkage tho.

The transmission kickdown linkage has to be made longer to work. I cut mine and welded in an extension piece. The throttle cable hold down bracket also has to be modified for clearance issues.

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The 727 might be a real close fit in the trans tunnel. You will have to change driveshafts too. If the 318 is fairly stock I would think about a well put together 904, unless you already have the 727. It will take less power to turn and should hold up just fine, aside from dropping right in.

After poking around at Moparts I tend to feel the same way you do, AnotherSix. Some guys there feel very strongly that a 904 is plenty stout enough to handle lots of power if prepped right. I'm not planning on making a power monster so I bet even a stock V-8 904 will be ok for my cruiser.

I have a 904 in my car, and my uncle runs one in his 10.5 challenger with trans brake. They are tough trannies. I see no need to go to a 727 until you are dipping into the 9s IMO

I have run the heck out of mine and never had a problem.

Well, after poking around on the net a bit more I have decided that when I do a V-8 swap it will be accompanied by a switch to an A-500 overdrive automatic. I just bought a MIG welder and I look forward to the modifications this tranny would require in my floorpan, crossmembers and such.

It's happening... it's happening.... I just got back from picking up a complete 318 from some 77-79 van. It was only fifty bucks so even if the insides are screwed I could probably make my money back on the parts. Now for an A-500...