Narrowed 8.25 Rear in 72 Dart?

My best guess, your 8.75 is about 49" drum to drum if 4" is off each side.

Inner fenders on non-mini-tub cars are about 42" apart

That leave roughly 3.5" of length extending beyond the inner well on each side.

Unless you had a wheel with zero to 1" of backspace, it isn't likely to fit with any wheel that is available. You can't get any backspace without tagging the inner well.