How did you get chev rally wheels (4 3/4") to fit the 5" on 5" Pontiac pattern '60 has? I can't imagine a 400/400thm swap hurting value, anyone in the know is aware of the problems/short falls with the early engine/trans used in the early Pontiacs. I put a 455/400thm in my '61 and now have almost 100,000 mi on it. Steve
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