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Looking at a 1966 427/425 - The rear end is a not original. The seller is telling us It is a 1966 3.55:1 posi 4speed 327v8 rear end. Stamp reads AN4166. Is this a major concern, being in a Big Block car? We thought the 4.11:1 gearing was preferred for the Big Block, the 3.36:1 ratio was less...