For good all around street performance, Vortec heads, dual plane intake (e.g., Edelbrock performer) and a 600-700 cfm carb (e.g., Holley w/vac secondary or Q-jet). As for the cam, it will depend upon your rear axle ratio, transmission, torque convertor and intended use. You should be able to speak with someone at a cam manufacturer (e.g., Crane, Comp, Lunati, etc.). about what you are building and what you want to do with it.
For a reasonable price, both Jegs and Summit offer new Vortec heads that would work great for a mild small block build. New production Vortec heads can be had with larger intake runners which would better feed a 383. Again, it really depends upon what you intend to do with your pickup (daily driver, weekend drag racer, towing, etc).
10239906 is the casting number for 96-up 5.7L Vortec L-31 with 64cc Chambers, 170cc intake and 1.94/1.5 valves.
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