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I say get the source/edelbrock heads,have the valve job checked,and put springs to match the cam.
You havent mentioned the gears.That would factor heavily into the cam on a 383 build.Be pretty easy to get 425hp out of this with some good heads and still be smooth down low.
Even 400hp will be sweet.Build for torque,put some 3.23's in it and cruise.Will be a blast from a roll on the street.

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Biggest factors ARE the cam/converter/compression and gears. The carb size is determined by a REALISTIC max rpm dictated by the combination.