Largest Rim Tire Combo for 68 Cuda

275-60-15 = about 2" taller than stock. 275-50-15 = about stock height. If you like jacked in back go 275-60, if you like fat and level go 275-50.

Then again is your suspension doing what you need it to do? I run E-70-14s with a sub 2 sec 60' time.