I don't know OC,
I just put 255-60-15 BFG TAs and Summit chrome alluminum 8" wide with 4.5' back spacing on my '69 Swinger and even with rolled lips I'm here to tell you it is CLOSE! I can only get my baby finger in between the wheel well lip and the tire on the driver's side and I can't quite get in on the passinger side. I swapped out the original 6 leaf springs with new ones but I got 5 leafs. I installed them and it did raise the car a bit but not enough.