383 needs more power
Yes , @ 230hp something is WAY off .
Well, probably not so much. There is the thing with how horsepower was measured back in the day... almost as confusing it seems
as the endless dyno discussion.
335HP back then was measured GROSS, so the engine was measured on a factory dyno sans accessories... naked so to speak.
The same engine was rated something like 280HP as per SAE NET standards installed with accessories, comparable how they rate engines today.
We are speaking flywheel horsepower!
Now take your 230HP measurement from the
chassis dyno, add the drivetrain losses, and you are at about 280HP at the flywheel again.
So not much seems to be wrong with your engine.
When you want more power, get better heads and bump the compression (which better heads will automatically do in most cases).