I don't know much about other brands of cars but with many Mopars, you'll have parts on them that are ONE YEAR ONLY and it sucks.
Engines, transmissions, axles, brakes and suspension cross over many years but stuff like body panels, emblems, sometimes interior pieces can be hard to find if they are missing.
For example, a fender for a Dart.....Each one of the following is unique to the year.
1967
1968
1969
1970-71
1972
1973-75
1976
The only thing I found different on the 76 fender was the antenna hole and shape of the fender around it. I don't know about other year Darts.
I realize you don't own a Dart, that was just an example.
MAKE FRIENDS with other Mopar guys. This will help you "network" to find parts and other good deals that you will need. Body and paint is always an issue that we classic car owners are asking about.