I ran 94 Cobra rims on my old 88GT without any major rubbing. Tire size was 275/40 Nitto DR's out back and 235/45 Falken ZEX 502 in front. The most rubbing occured on full lock turns. The rim would would rub the front A-arm. If you want to check out the fit look in my sig on the snap shot page there is a few pics of my old

88.
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Mike
My 86GT site