Tips on inspecting/buying a 40 year old car?

When I was needing to look at a Road Runner about a 1000 miles away, I called a repair shop that was local to the guy. I offered him a $100 to put it up on a lift, check it out and drive it. Guy called back with nothing but praise and even told me not to worry about the $100. He said it was a pleasure driving it.

I know I just got lucky to find someone like that, but man that car was nice. $10,500 for a great running 383 4 speed RR clone. 10 years ago. Can't find those deals anymore.