We installed 335/30/18's on a customers 67 using our chassis a couple years ago.. that was a 12" wheel. However, we've had a couple guys with 66's that claim there's no way a 335 will fit.
315's are a better bet, using an 11-11.5 wheel... Or you'll have to cut into the floor a little bit to narrow [our] frame rails in.
-Dale
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