Will 255/70 fit on a 72 dart

I picked up 2 prostars this weekend at a swap meet 15x8 with 4.5 bs. They are wrapped with practically new 255/70r15 tires. Paid $250 for the pair (back 2 only). I have done my research and understand 255/60 will fit but was not sure if the 70s would rub. The guy told be he had them on his 70 dart with no mods.

My setup will be an 8.8 rearend swap with offset hangers. Thoughts?