Something is not right
A few thoughts.
You have all the motor you need, but it not making power. I think something is not right. Does it run smooth? How big it the carb? What is base timing at 600 and mechanical at 3000rpms?
What is your intake vacuum at an idle? This can tell alot about the tune on the motor and if the cam is in correctly.
I just worked on a beast of a 455 today with no power and won't idle. Could not get the carb set. It turned out to be 600 jetted for a 800.
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