Here is my '65 Tempest project, with the ultimate set of wheels and tires.
The wheels are American Racing T70R's with billet 200S caps. They are 15x7 with a 4 inch backspace in the front, the rear wheels were 15x8, they have been widened in the backsides by Weldcraft Wheels to 15x9 and now have a 5 inch backspacing and zero offset.
The tires are BFG T/A Radials, 215-65-15 in the front, and 275-60-15 in the rear.
The car sits a couple of inches above stock, I used '66 GTO springs CS5244 front and CS5235 rear.
The original rear end is in the car. There are no clearance problems.