BoredandStroked,
From my calculations you'll need a head with 196cc's of port volume and 314 cfm's of air flow. If this seems small it really is but you don't have much of a engine either, as you basically have a large bore 318. A 318 has a stroke of 3.31 and a bore of 3.91 where as the 383 is 3.38 and 4.25 so camming and headding can easily be over done. I have a engine that makes 535HP in a 400 CI engine which is a larger bore but the same internals of a 383 and I only have a a set of heads that are 184 cc's on it. They cost about $700.00 total with springs, retainers, and locks, as for valves they are MP as they are made by Ferrea which is one of the best that you can get. I used a small hyd. cam so to keep the streetability and was able to race with it also. The heads are 452's with some minor work. I guess that it's a matter of preference if it's aluminum or iron heads. You may want to take a look at the new Max Wedge heads that are iron from ma mopar they come 190-195 cc's from the factory and have the same chamber that the eddy's have and you can get them for $400.00 or so from Mopar each bare, but you would still be ahead as you can get better parts to suite your needs, than what eddy's have. Also from experience that the eddy's have to have some work done before they can be used anyway, you'll be that much further down the road with more $$$ in your pocket. The nice part about the new heads is that they use all standard parts as in valve train, intakes and exhaust, and flow better out of the box than a worked set of stock heads and are better than eddy's other than weight IMO.