I have a set of 17x8 Torq Thrust II's with 4.5" backspacing off my '81 Z28. 245's front and 255's rear. I tried swapping one of the rears onto my GN and the tire touches the frame. I know that ideally I need 4" of backspacing. Would a 5/16" wheel spacer be enough for me to use these wheels? I'm thinking about just using them to mount up some drag radials for the track.