456 gears

Where was it dyno'd? What headers do you have? Was it dyno'd with your carb and headers? There's no way it's making 628hp. Even that cam is way small for that number. Did you see your engien on the stand, or was this done when you were not around? Something aint kosher. I would be expecting a number around 550 with that cam and compression. your ETs show a lot missing. It's down for some reason.