News:
245/60 bigger is better + fills in the wells better.
I run 245s on the front of my 70. I know every car is just a little different, but there are no problems or rubbing at all on my car and they look good with the 275s in the back.
From my personal experience, I've had 3 different Cudas with 245-60-15's on them with 15 X 7 rallye wheels with standard offset. All three cars had some degree of rubbing with the tire rubbing on the frame rail at full lock. 1 car was just slightly, the other two more so.
I'll probably just buy the 275's and leave the 235's up front I guess, just want to fill out the rear a little more, for some reason I thought my old car had 255's on the front.