They made a 7 1/4 rear with 5 lugs? I'm pretty sure he has 5 lug rear. Would he have an 8" rear instead?

Yes, all the brakes were redone front and rear when Gene and I was there. I think they were 10" by 2.5 front and 1.75 rear. If memory serves me.

You will want to be careful swapping sizes brakes by keeping the front and rear in balance. The fronts need to maintain a larger size from the rear or you'll be needing to proportion them.