383 build no power

Strikes me as a mismatch of parts. Any 383 should burn tires. Even a low compression one.

That cam might be too big for your setup. What heads are you running? What intake? What happens when you try to burn the tires? Does it just stand up and kinda sit there? Like it wants to but can't quite? Or does it not even try?

Before you start looking at cams. Look at the whole setup. Pick thing's that will run together, not against each other.