69 cuda wheel size

The front of my 68 Barracuda will not accept a 14x8, no matter what the backspace, without rubbing somewhere.
A 7" is no problem.
A 7.5 with a 3.75bs will require a bit of "fitting".
On the back,
almost anything goes up to 8.5. Then the bs becomes important. Mine are 4.5bs. If you move the springs, you can put 10s in there with a custom bs . If you narrow the rear, you can fit some off-the-shelf 10s; I narrowed my rear to the limit and 15x10s @4.5bs fit 325/50-15s with just a bit of "fitting".