383 for a 67 cuda

If you want to stick with the 383 block, the longer 440 stroke will help with getting you to 500+ Hp. I believe 434 cubes is what that combo nets. For that power level, I think something along the lines of a mildly prepped set of Edelbrocks RPM heads should be plenty. Make sure you have a decently high compression ratio. Stock stroke 383's are hard to get decent compression with, I assume the pistons that go with the stroker kit will address this. I would shoot for 10- 10.5:1 compression. Good intake and headers, and I would run a cam in the 240° @ .050" with .525-550" lift. I'm not a professional engine builder, but I would bet that will meet your goals easily.