I have a 70 Duster with a Dana, and leaf springs moved under the frame rails, and factory wheel wells widened to fit flush with the frame rails. Wondering what the max size slick I can fit under there and still have the car sitting nice and low. It has 10' wide American Racing Trackstars, I forget the backspacing. Thanks for any and all help. Any pics would be awesome. I know I need to stretch the wheelwells a little also.