https://forums.maxperformanceinc.com...ntid=19578&d=0
I narrowed the Ford 9 in my ‘64 GTO that was already installed in the car when I bought it to precisely center the wheel/tire combo in the wells. I was able to stuff a 10x28 slick on an 15x8.5” Centerline without doing anything other than a little light hammering on the inside inner fender tub.
I liked the rear wheels so I modified the axle housing to put the wheels where I wanted them.
Later on I went to custom built steel wheels built to similar dimensions to the Centerlines I replaced.