I can't remember the backspace on my wheels right now so when I get home I'll see. I used the b-body Dana and 12 inch welds and M/T sportsman tire 29" tall, I think they're 14-15 on the tread, of course the frame is moved in and original tubs are widened 5 inches. New box frame back from the trans crossmember. Fits real nice up in the well.
I'll be back