383 for a 67 cuda

Here is a build that shows what the 383 is capable of both if you're going to build it stock or build for 450 ish HP. First thing I'd start out with are a set of pocket ported 516 or 915 closed chambered heads with the 1.74" exhaust valve. Those will bump up the comp. almost a full point over the 906's used in the article. Any HP wishes for over 475 HP out of a 383 are require a ton of work and money to hog out a set of cast iron heads therefore a set of Edelbrocks would be the way to go accepting that they'll also need a little port work.

Needless to say this is only the beginning cuss then there's the converter/tranny/rearend/suspension/braking/cooling/sub frame connectors.:read2::read2::read2:
Been there more than once.

http://www.moparmusclemagazine.com/techarticles/mopp_0209_383_engine_restore/index.html