I have no Idea where to start

Everyone has given me great advice so far. I really appreciate. I want to make sure the safety stuff is good so I'll be te as ring things down to suspension this weekend and working my way up. It has carpet but not molded carpet, it's like someone grabbed a roll and threw it in. Yes it's the one in Oklahoma, owner was Ace. I agree about the aftermarket A/C set ups, I had just seen that when I read the post. I'm not sure if I missed it or not from a response but how specific are service manuals? Does it legitimately have to be 1968 Dodge Dart GT or are the manuals for a "family" of cars?

Stephen B.