sbc421, I'm running the same size on my 70. 31 16.50's Mickeys.
I bought Vintage Wheels "ralleys" with 8" inside offset. Your tubbing method will work perfect. Although, I want to try 29 18.50's with the same setup. The 31's are too tall for my likes.
Stepside
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:thud 70 sstep tubbed, Muncie, double hump, snowflake,
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