Headed to the Dyno. Any guesses?

And just for comparison, another small block ford on the dyno here. 434 CI hyd roller 8.5-1 compression trick flow heads, And one of the engine builders good race carbs. Made 614 HP. I would not have believed it either, but the combination of the heads and the cam profile work really well with this 434.

This is a procharger combo as well, with the belt on and some boost the motor made 870 HP.