show me your 295/60/15 or 295/50/15s !

If these are for your 68 you'll def have to modify your wheel wells.
My 67 has an offset spring kit in it and I was running BFG radial T/A's, 295/50/15's with a 10" rim, 4.5" wheel backspace with the openings rolled and I had a slight rub on the sidewall over bumps. 1/4" space at the springs.
I sold those T/A's and bought Nito's, 275/50/15's. They have the same amount of tire tread on the road but the sidewall is flatter with a smaller overall tire diameter and profile. The stance is better, not as steep and the fit is perfect.