need stock front wheel back spacing on 68 gts??15x6s/7s up front?? or 14"

I'm pretty sure that if you use a wheel with the same back spacing as what dgc333 has you'll need it to be a 15". A 14" wheel with that backspaccing will hit the upper control arm and possibly the steering knuckle. I had 14x7" wheels with 4 3/8" backspacing & had to run spacers to fit them on the front. Just an FYI. 15" wheels will give a better selection of tires.