I want to thank you guys who've been such a help so far. but I've got more!!!

Got a factory manual CD from Detroit Iron. Uploaded it this morning, but it has nuttin' about heating/ cooling/ removal of heater core, etc.
I noticed it does have a whole section on leaks. Hmmmmm.
Can anyone recommend a CD that does have a section on the heater and A/C, etc.
Maybe I didn't look far enough, but I didn't even find basic tuneup and capacity info. I was in a hurry to get to bed.

Also, I ordered wiper post seals from Shumacher who is right here in Seattle.
But I need a new wiper switch. He can't supply that and said I need the MoPar part # iot find on over the internet.
Called the dealer who siad that he doesn't list anything older than 1981.
So, can anyone supply me with the wiper switch part # ('74 Duster) and/or a supplier?
I called Paddock who couldn't help. Was out of time by then.
Also, does anyone know if you can get a switch with a wiper delay or if there's an add-on unit that will do this?
Thanks a lot.