I have a 69 charger with a 275 40 17 with a 4.5 back space on the front tire . I tried the rear tire on the front its a 295 45 18 with a 5 inch back space it hits the sway bar . what are you guys running? its stock torsion bar and tubular upper and lower arms with Hotchkiss sway bar . I put a 345 30 20 on the rear 12 inch rim with 6 inch back space. But for the front I am thinking 285 40 on a 18 or 19 inch wheel . thinking 4.5 back space still . thanks