Wheel specs for 69 Valiant

With a 255/60/15 tire you may be able to go to a backspace of 4 1/2''. The tire maybe getting close to the leaf spring. A 15x7 mopar steel factory wheel has a 4 1/4'' backspace. I have run that wheel and backspace on several early A's and the Darts/Valiants from the 67-76 era (excluding the Duster/Demon/Dart Sport that have a larger rear wheel opening and can fit a larger tire.) For a 69 Valiant a 245/60/15 may be a better size. And every mopar will be slightly different due to manufacturing tolarences.I have found one side fits better than the other in most cases.