Wheel Size for 1968 Barracuda

If you are going with 225/60/15 in front do it on a 15x7 rim with 4.25 or 4.5 backspacing.

Or a 15x6 rim and try to get 4.25" backspacing. But I think many15x6's will be 4" backspacing.
I have a 15x6 with 4” backspacing for the front and I’ll have 15x8 with 4.5” backspacing in the rear for the 255’s