15x7 cragars on the front of a 69 dart?

I think its almost the same, just 1/8'' more backspace (I believe stock is 4 1/4?), and if I'm not mistaken, doing the disc swap is supposed to push the wheels out 1/2" further than stock, I measured and 4 1/2'' backspace "should fit", but the most backspace they will put on a 15x7is 4 3/8"......................I could play it safe and go with a 6'' wheel, but I'd prefer the wider rim...............Anyone have any experience with this setup on this car? I've searched the forums for hours and can't find it.:dontknow: