With 4.11:1 gears i would consider the RAIV grind. I guess no long trips?
I´m using the #744 in my 462 w/TH400 std converter and 3.55 and it´s a torque monster.
Also, the #744 REQUIRES 125lbs valve springs@1.586" installed height.
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1966 GTO Tri-Power
1970 GTO TheJudge
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