371 build W/Big Mouth heads

RAMM said
I'm looking for well over 500 HP @ 6800 rpm+ to consider this build a success.

So this seems to be a success, at least horsepower wise...
And with a big honking SFT and "only" 371 cubes one probably has to put up with the manners below 4000.
But then you said you will try some more tricks. :)