I'll explain the best i can, it's kinda odd.
I have 2 different offsets, one set for the front of an sn95, one set for the back.
I had the backs on the front, and the fronts on the back.
With a 265 35 18 tire in the back (regular tire), there was no rubbing.
When i switched to a 275 35 18 drag radial, they rub under hard cornering.
But the drag radials are monsters compared to the regular street tires.
For the fronts, i think i have a 245 35 18 (i have to check though), and there is no issues at all.
The rim stretches the tire a bit, but makes it fit even better.
This setup i had the same for my lincoln rotors, and my cobra 13 in brakes on 95 spindles.
Same with the rear, had it with my drums, and my sn95 cobra rear discs.