yep same here 255's no mods on 15x7 steelies and rallies the valiant pic is for reference i have run the rallies that are on the back of it on the dart... 2 different brand tires they are snug but never rub!!
just to help u get an idea here is my dart with 17x7.5 wheels im not sure on the rest of the specs but they are 5x114.3 pattern sorry pic is blurry old cell phone pic....