Another No-Mod Tire Fitment Question

If we are talking about the blue '72 Dart, the 4.25" backspacing 7" wheel will not allow anything bigger than 225/60R15 front or rear. It MAY be possible to squeeze a 235/60 on the back, but do you want to have potential rubbing issues? Plus, IMHO a 235 tire really needs an 8" wheel to look right and not be pinched in.