My 66 has 77 Granada front disc and 77 Versailles rear end with discs. I had to custom order Torq Thrust wheels and the widest my shop could fit was 15x7 front with 4.0 inch backspacing and 15x8 rear with 4.75 inch backspacing. Tires front: 215/60, rear: 225/60.
I probably could have gotten a 215/65 up front but it rubbed so I dropped to the 215/60. However, I found that it was rubbing on a small section of the fender lip that I forgot to roll. Once all fenders were completely rolled, my rubbing disappeared.