With 4.10s you will have more get up and go but less likely to spin. Mine is not drivable yet so I am not sure what gear to use. I was planning a 4.10 also but a buddy of mine stopped my last month with a 4.11 66 Chevelle and said it is too much for every day use. I had 3.89s in my Big block Nova 30 years ago and thought it was just right.
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