Performance Lacking in a 383 Build.

[88Stanger]

Well damn, sorry for the issues you have had.
I have a 383 stroker i am going to run, with Edelbrook aluminum heads (same or close to the same as you), full roller Howards Cam, Lifters and Rockers but the cam is not an RV grind i called and got a cam grind built for the 383, Muncie 4-Speed and 3:42 posi rear.
I am interested to hear what the engine builder has to say. I built my engine, but had the machine work done a respectable outfit in town and then me and my anal build mind took a week of measuring, testing, and such to build it. I fortunately have alot of the tools to test the fitments, not saying i know what i am doing, only saying that if it is bad or not right, i can only blame myself.
I wish you all the luck possible and look forward to your excitement of how "Snapping" the torque monster has!!!