Door alignment issues

One thing to remember, like Oldmanmopar, mentioned with his doors. These are old cars built with the technology of the time.

Production tolerances are nothing like they are now.

I can show you gaps and panel fit on both my wife's 73 Dart (original 90,000 mile car), and my 68 Barracuda (62,000 mile car), that would not be acceptable today, but were perfectly normal for the time.

The only way to get perfectly even and uniform gaps on an old a-body Mopar is to reshape by adding or removing metal.