what size rally wheel on the front???????

Thinking about going to little more of a stock look with my 67 Dart. I want to get a set of factory rally wheels in a 15" x 7" for the rear but not sure what to run on the front. I have converted the car over to 4 1/2" bolt pattern front and rear. The front has the '73+ disc brakes. Would I be able to run a 15" x 7" on the front with the stock 4 1/4" backspace? That is the narrowest 15" rally I have seen.