I don't know what the offset works out to on the front. But if you want to run a 4" backspace, you'll need to drop to a 7" wide rim. Even then, a 4.25" backspace would be better. You might get away with it if you use a 225/55 tire.

Remember if you have too much backspace you can always use a spacer to adjust, but if you go too shallow you're kinda stuck.

P.S. If you go too deep, it rubs on the frame first at full lock. So worst case is slightly less turning radius. To shallow you rub on the inner fender itself as the suspension compresses which is a real concern.