You don't want to go with 315/35/17 on 17x9 rims. You want at least 17x10 or 17x11 preferred. I ran some 255/50/16 on my 16x8 wheels on my 68 Camaro and they were a great compromise from getting 17x9 wheels with 275's. So if you're keeping your current rims you're looking at 255/50/16 most likely.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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