Widest Tire/Wheel combo for a '72 Duster?

Yes, I know it's an old thread but it looks like a 275/60-15 should fit on the rear of '72 Duster without having to mini-tub or move the springs inboard with 15x8 wheels on 4 1/2" of backspacing.

What about the front? I'd like to run 235 or 245/60 15's. Is this possible without moving the wheels way out or severley limiting my ability to park?