Factory steel Rally Wheel application guide??? Does it exist?

Your car came with either a 14"x5.5" big bolt Rallye wheel or a 14"x4.5" steel wheel with a full wheel cover. And either a F70-14 or E70-14 tire.

No A-body's came with 15's...You would find 15's on an E-body,ect.
Even though I like the sombrero centers better,I thing I would have gone with the later style on yours.

15's look great on A-body's,with a 60 series tire.
I had a 74 Dart that I put 15"x7" factory steelies and a 235/60-15 all around,and it looked tits.