Ok, from the replies here and looking at the car, it's lbp which would make it 4.5bs, correct?
If I wanted to go with 16s, would it be as simple as 16s on 5@4.5 or adapters and such needed? A tire size that would fit front and rear without spacers?
I believe all '73s had front disks...at least the V8s did.
You're right on about the 4.5" bolt circle.
16" wheels don't look right on these cars, IMO...Years back, I bought my 15"x8" Rallye wheels for my '73 Dart Sport and they look perfect on the car...factory offset is a sure fit.