Hey I've been on this site a couple times reading opinions and methods that I've found off google... But due to your websites security I figured I should just sign up. Anyways what I've got is my 1978 Monte Carlo 350csb. The motor is out of an 80's pick up and needs to get swapped out again for something more beefy. 383 or 454, I can't yet decide (OPEN TO SUGGESTIONS) mild performance upgrades on the motor.. Cam,intake man,fan,distributor,and fresh spark plug wires. I've got American racing outlaw wheels 15x8 with 275's in the rear and 255's up front. Looking to change my cars stance with the widest wheel and tire combo i can possibly go with this car without doing damage.lol Looking to get something like 10.5" or 11" in the rear? I need some help with backspacing and offsets! It's nice to be apart of this forum and I look forward to hearing from you all