What is your HP to cube ratio?

We can theory to death, agreed, fun with some; some will argue to the moon, without racing. So many variables, last 2 weeks, took a Charger 440 to dyno. Best pull 339 at year, dyno showed bog on sec opening. Fixed carb (still lean at opening, but better) and replaced that procomp pos dist, that had a bent shaft from the factory. Still 339hp. Move total time all over the place; 339 again.
You running full exhaust?