safe wheel size is 11" wide on 67-68 with a 315. You can force a 335 under there but you have to be dead on with backspace. Also choice of tire will help as well. Nitto Invos are on the narrow side compared to BFG or Michelin. Dont know why, they just are. As far as backspace I would run 5.5" and rear end width should be around 54.75 axle flange to axle flange.
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Mike Redpath
Musclerodz & Customz
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