Here is my 70 Dart. The rear is narrowed to 56 1/2" from WMS to WMS. The rear is moved back 1.25". The wheels are Ridler 695's
18x8" in the rear with 4.5" BS
255/45/18 (27" tall)
17x7" in the front with 4" BS
25.6" tall tire in the front (plan on going with a shorter tire)
