Will 7 inch be ok on 69 dart

15 x 7 with what backspacing? 4.25"-4.75" should work on the front.
I agree X2, that's what I have on my 67 with 4.25" backspace and everything fits. I'd be more concerned with the rear. I'm running 255/60's and they rub the fender lip when I do doughnuts! lol I could roll the lip for more clearance.