Yeah I found that 3.73s are pretty much the sweet spot for 600+ hp, the 3.55s are only like a 200-300 rpm diff.
For grins, on the 535 engine I did 3.42, and now wish I would have done 3.73s.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
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