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I have already given it the thought that it would possibly be cheaper to rebuild the factory motor, put in a good cam, and hone or bore out the hi-po manifolds and factory intake to allow for better air flow. Will also port and polish the heads (2.08int., 1.74exh.). Does anyone know if this is the '906' head and if they are good heads?

I want to build this motor up and run real nicely but still have the ability to put a ricer in its place on a rare occasion. Anyone have suggestions for getting a HP 383 to make 400+hp using the "stock" appearing parts such as the intake?

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400 hp is fairly easy. The key for the 383 is compression which they unfortunately lack. The heads will probably be 452's i believe. You would be well ahead if you pick up a set of 915 or 516 closed chamber heads to get the CR up. if not plan on getting good pistons or doing the math on heads and deck...believe me DO NOT overlook the issue of compression on the 383...I have learned the HARD (expensive) way.

I am running 516's with the 1.81/2.14 valves, Cc's version of the MP 474 cam (233/240 @ 0.050 w/.474" lift) KB 162 pistons (not recomended), holley SD intake, and a Mighty Demon 650. Motor dynoed @ 400/430 (HP/Tq) The motor looks very stock with the stock air cleaner on and it has plenty of grunt for around town.

With 3.55 gears or higher it will stay with plenty of stuff around town...higher the better obviously. I am running 3.91's.