Hi folks, I just bought a 1981 buick regal body and I'm going to fix it up for my oldest boy. This kid with his younger bother loves the drag racing. What back spacing to use with a weld drag star. I want the wheel to fit under the car. 15" Front and rear sizes would help. Also the car has a 7.5 in it now but I will have a 9" in it before long with the stock length. ANY PICS WOULD BE A HELP ALSO