Will 225/70/15 Tires Fit on Front of 69 Dart?

That is an awfully tall tire, so for it to fit you're going to need a quite high ride height.

The 225/60-15 was basically all you could fit in the front on a 15" wheel on my Duster. Just barely clearing the front fender lips when turning. The 225/70-15 is about 1.8" taller. The car just flat out isn't designed for tires that tall.