The cam is restricting the engine. That's something I'd have ran in a B-Mod.
It's worth the time to switch it out. Try the JR109. Everyone hates cheap camshafts but for the money it is the best thing you can buy. I've run it in 355's, 383's, 377's. Once you do that you'll see a pretty big improvement on power and torque. That 383 should be able to rip the tires off it with the parts you have in it and the heads/intake combo.
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