most likely you have a 400 and some had 2bbls. Might be 300hp but probably more like 250hp depending on heads, two numbers are cast into the center exhaust port on each head... these two numbers will indicate which heads you have.
Your rear end is a 2:73 duration, if you want a lower geared rare 2:93 Big Pontiac Safe-T-Track positraction complete drum to drum check out e-bay under Pontiac posi.
Big Ponchos are cool.
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1969 Black Bonneville convertible 428HO
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