Concerning vacuum, my car had manual all drum brakes from the factory (luckily was given power steering) but I do plan on converting to manual disc brakes for reliabile stopping.

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...FWIW, I wouldn't run that MP cam in anything less then a 440 in a B-body too much weight

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I'm confused, what are you saying? Are you saying its not worth it to run a 383 in a b body or are you saying that cam is too much for a 383? Please clarify cause I got lost with that.