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Originally Posted by b-man
Go with the 455 for the best street engine if torque is what you’re after.
A bone stock 455 will make you smile, and will be less expensive than a hotrodded 389.
Both engines are great and have their place, but on the street cubic inches gets the job done without the need for ported heads and big cams.
Another thing to be aware of is 1966 389 blocks are not known for their strength and are also known for having very thin cylinder walls, I would avoid building a hot engine using that block.
A big Bonne needs a big engine, you won’t be sorry going with a mild 455. In later years (1969 for example) the 428 became the standard Bonneville power plant while all the other big Pontiacs came with the 400.
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Big cars like 455 engines...makes them act like "A" bodies. 
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