1973 Dart Swinger Owners + 17" Rims

I have 17x8s with 4.5" back spacing on my 67 dart. they work fine but when you look at the car from the rear, the fronts track about 3/4" wider than the rears do. I have 225/45-17s on the front and 255/45-17s on the rear. I have another set of rims that are 16x8 and 16x9. The 16x9s have a 5" backspacing. they fit but they are tight and the tires rub a little on that ridge you are talking about when making hard left turns.