255/60/15 - stock 70-72 Dart

Question,

Does anyone know if you had a custom offset made for a 70 Dart if a 275/60/15 will fit. Trying to mount widest tire possible without moving the springs or cutting the car up. I will order whatever offset will work from Wheel Vintiques stock looking Ralley wheels.

Trying to get as much rubber on the ground as possible.

Mad Dart,
I know of a 67 with the offset hangers/shackles, a stock length A-body rear, and Moser axles that has 275/60/15's on a custom 15x7 with 5" backspace. Don't have any pics, but from what I've seen of the car there is about 3/4" clearence between the lip and leaf spring...

DD