Attn Swinger owners

I need to check my tire size. I have 15 x 8.5 with a 4 7/8 backspacing. The lip is rolled. We are talking maybe a 3/8 space to the leaf spring and my car has the superstock springs which raises it up. Note: 73 swinger, lower tire pressure the tires rub, to remove the wheels I have to jack up the body to clear the fenders. I think 15 x 8.0 with a 4 3/4 spacing might be better. maybe? Check, measure, check, measure again !