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Old 06-21-2018, 09:50 PM
carpoor carpoor is offline
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Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
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Prior to 72, GM over rated their engines. There was a story about it in Super Chevy about a decade ago. A 70 LS6 454 450 HP only made about 280 to the wheels. (18-20% drivetrain loss means that it really only made about 340-360 real world HP) They used gross HP rating vs the current SAE net ratings.

A healthy, modded 396 should made 450 HP no problem, maybe more. You'll be more than safe with the 650 HP unit.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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