what will the Horsepower be????

Ain't that the truth.

I bet you cold find a dyno that would kick out a 540hp number. Truth is it would NEVER run a MPH consistent with those HP figures. Back to those pesky time slips.

I bet you'd be in the 475-490 range with a good tune.
I have pointed this out in other threads, but NO one agreed with my statements........ET, weight, and MPH are much bigger truth tellers than a dyno, ESPECIALLY the dyno of whoever is building your engine! As tony said "timeslips never lie" But my guess is about 480..........