tire size

For that size tire, a 6½ inch wide rim is required. IIRC, the A-body rally wheels were 5½ inch wide. For this rim width, the max is a 205/60. I have 205/60-15s on 7 inch wide Magnum 500s on a 73 Dart Custom. There is no problem with clearance.

I have 235/60-15s on 7 inch wide cop rims on the 72 Demon. In the rear it is close to the spring, but acceptable. I don't have any problems with interference with the inner fender. I know that the fender openings are less restrictive on the Demon but don't know about clearance with the top of the wheel well.