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With the 7.50s I'd go with the 3.54s. It might help if the trans has the 15/29 gearset. I have that combo in my 41 pu with 6.50s and it's fine. I also have 3.54s in my roadster with 7.50s but that is a lighter car. That has the 16:28 gearset.
Mart.