15x 7 cop wheels fit on stock 67 Dart?

I've had 255/60/15's on 7" stock steelies, which are the same bak space as the cop wheels, on my 64 dart. Tight fit slight rub in hard cornering. My buddy has that same combo on his 69 with out issue. About the axles, if you use a body backing plates and redrill your brake drums it doesn't move the wheels out. Got Moser axles for mine w/green bearings. The problem lies with the b and e body backing plated and drum.The ECI rear disc conversion moves the wheels 1/4" out.