I am planning to get 15 by 8 Buick Rallys from Wheel Vintiques with 4 1/2 back spacing. Does anyone else on here use these size rims on their 68/69 Skylark? I would like to go maybe 265/60/15 on all four. Does anyone know what is the largest tire size that can fit with stock suspension on my 69 conv.? Any input is appreciated. Thanks