Stupid pre-buy questions

You can download a lot of the factory service manuals here MyMopar - Mopar Forums & Information - Service Manuals

It actually doesn't have a 72 manual, but it has a complete '70 manual and a complete '73 manual for the dodge's. The '70 would be closer for a '72 because of all the changes made for '73.

Here's the '70 http://www.mymopar.com/downloads/servicemanuals/1970_Challenger_Dart_Service_Manual.zip

There's also a '72 Plymouth Chassis manual, should be pretty much the same

http://www.mymopar.com/downloads/servicemanuals/1972_Plymouth_Chassis_Service_Manual.zip