15x7 with a 4.0" or 4.25" backspacing should be the key to "no rub". The issue usually is not the sheet metal per se, but the inner tie rod end/tire sidewall clearance, up front. In the rear, it's the inner tire sidewall and leaf spring clearance, plus the outer quarter panel/wheel opening with fender skirts.
P235/70R-15 is equivalent to the original H70-15 size which came on the earlier Sport Fury GTs. FWIW, Chrysler C-body wagons were spec'd with 15x6.5" steel wheels.
End result, your desired tire size is not much different than prior C-body tire sizes. If using an aftermarket 15x7 wheel, then the "backspacing" spec becomes operative. IF using a factory Chrysler 15x7 wheel, steel or alloy, I suspect everything should be fine, at stock ride height. Perhaps some others have more experience in this area?
Just some thoughts,
CBODY67