Largest Rim Tire Combo for 68 Cuda
I've run 15x8's with a P255/60/15" 4.250" backspace (pic attached). I also had SS springs. Some people claim they can fit P275/60/15"s under there but most cars seem to vary so it's a "plug and play" with the vehicle you have. Any good tire shop with work with you and get you the "look" you desire.