15x10 steel wheel with a 4 inch backspacing on a 69 valiant

Rather than starting a new thread i thought id ask here. How about a 15x10 wheel in the rear with 4" backspacing on a 75 dart swinger? Found a set of Cragars with tires for a deal that are 15x10 4" backspacing and 265/50/15 tires in the rear and 15x8 up front and 225/50/15.