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1QWIKBIRD is really talking a lot of sense here, Bubba.
I was very involved in the building of my brother's two engines. One was a 383SB, the other a 427BB. Both engines were professionally built and dyno'd on the same engine dyno during the same week and atmospheric conditions. Here's the rundown.
The 383 is/was a 9.7 compression motor. Comp 292H cam, fully ported and polished fuelie heads (2.02/1.60 valves), KB hyper pistons on an Eagle rotating assembly. Crower 1.6 roller rockers, ported and matched Air Gap intake, 750 holley. It made 430hp and 470 lb-ft, ran excellent on pump gas and could probably be done up for 5-6 grand.
The 427 is a 12.5 compression motor. I picked out the cam, it's a Crane solid roller with .714/.714 lift (not sure of the duration). GM 049 heads pocket ported with 2.19/1.88 valves, JE custom pistons on an Eagle rotating assembly. GM/Crane 1.8 roller rockers, Victor Jr intake, 830 Race Demon RS. It made 621hp and 555 lb-ft. This costs about 10 grand. Runs on pump gas, though we use GT100 to be safe. Mild enough to be driven on the street if it wasn't so loud through race bullets.
My point is this. The aforementioned 427 looks like what you want to do with an N/A 383. That will be tough to do considering you want to run fewer cubes, with less compression, a smaller cam, and (chances are) heads that have more turbulence and may not flow as well without work. To get to that power you won't just be paying for parts but also paying for labor to port, polish, smooth, flow, etc. Building a 383 that is around 500hp will be a lot easier of a goal to attain. The 383 above could probably do that with a better cam and more compression.
I think I speak for more than just myself when I say that I want you to build a kick *** motor that you will be happy with, and I DO NOT want to see you with a pile of parts and empty pockets. That happens all the time. Example: If you go solid roller on the street, you are looking at Isky Red Zone or Crower HIPPO lifters if you want them to last for very long. Non HIPPO lifters tend to need replacement quickly since they aren't lubricated as well. Just the lifters will cost around $400. If you don't plan for that, you may end up being able to afford only part of your valvetrain.
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