A body parts availability
Parts aren't bad for the more popular stuff, BUT with any classic car buy the most complete version you can. If you avoid rust and major body damage you will be money ahead. A done car is almost always less expensive than restoring one, but you may not find one that checks all your boxes. Even in 1983 we bought the most complete Dart convertible we could find in our price range. It just happened to be a '68 340 GTS. It was rough, but it was all there.