Actually, several have been boosted with both turbos and centrifugal superchargers. I don't know of any max-effort race builds but I know of at least one that made over 400 horsepower reliably and I would suspect that the bottom end would support quite a bit more with some forged rods and pistons. Chevy small-block internals are easy to come by, making rod and piston choices readily available.
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Founding Editor-in-Chief, Poncho Perfection 10/1/15-12/31/24)
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Author:
"Grand Prix: Pontiac's Luxury Performance Car" (4/27/07)
"How to Restore Your Pontiac GTO" (7/15/2012))
"Pontiac Concept and Show Cars, 1939-1980" (3/25/16)
"Pontiac Performance 1960-1974: The Era of the Super Duty, H.O., & Ram Air Drag & Muscle Cars” (10/15/24)
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