I tried using a 12 drag lite 3 1/2 bs on my 68 Dart. Mini tubs, spring relocation, inner fender rolled, 1/2 wheel spacer, 44' dana, 12x29 Hoosier slick. If I remember correctly I have 15" of wheel well opening. The 12" wheel widened the center section of the tire and they would not fit. I use a 10" 3" bs weld star without a spacer now.