He's looking at a fairly radical camshaft so he will want to keep his overdrive in the 2000rpm range minimum with a big block chevy. Especially since it will be carbed. Mine is comfortable at 2k at around 60 mph. That makes it comfortable for most highway and all freeway jaunts. I agree with flash on the low 1st gear. I wouldn't want lower gears than a 3.73. I considered 3.55 gears but ultimately decided on 3.73 due to wanting to be in overdrive around 60 mph. The T56 is a whole different ballgame.
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Todd
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