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I ran Hoosier 315x35x17's on my Superformance, before I put them on I had to modify the fiberglass interior to the body near the front section of the wheel well. You can go to my photo's and check out what was done. The amount of fiberglass removed varied between the right and left side. This was a fairly easy fix if this is where you are getting the rubbing. I also had the wheels widened to 10.5" by Stockton Wheel, this is the proper way to fit the larger wheels. I had plenty of clearance on the fender and the fix was more internal. I am only guessing this is where the issue is and I would recommend these two changes if you are using that size tire.
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