It will definatley fit without any problems, in fact, they put them in in the factory, so it better fit. Might need to upgrade the tranny and the rear end to handle all the extra torque though.
But, if you currently have the original motor, and you want to keep it a #'s matching car, you can get a boat load of power out of a rocket 350. If it doesn't bother you, go for the 455. It's what I am planning to do.
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Yellow 1972 Olds Cutlass
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