15x7 wheels- fit 65 Cuda?

I had 245/60/15's on the back of my old Valiant. I purchased new leaf springs from ESPO, arched 2" over stock and installed new KYB shocks. The rims were 15x8 with a 4.875" backspace. Fit fine, small amount of clearance by the lip, about 1/4" to the springs. No issues unless I had two 200lb dudes in the back and only on sharp corners. Before the springs they rubbed, but the old springs were shot and were not supporting the car.