Did you degree the cam? DID YOU DEGREE THE CAM? I never saw that question answered. This help stuff is a two way street. If you stabbed that cam in straight up with a timing set that cost less than 100 bucks, therein could be your WHOLE problem.
I think the pressure is low for that cam and static compression ratio. The mph says it's making power once the airflow catches up. My first check would be cam accuracy. MP cams flat out suck as far as their actual grinding. They've neem POS for decades now because of it. Pull the front off it and stick a degree wheel on it if you haven't.
