Well i finally dyno my car today and results are:
550.35 horsepower
537.14 torque

Motor Spec
GM 6.0L Iron Gen IV Block
4.125” Stroke 4340 Steel Crankshaft
6.125 H Beam Connecting Rods
ARP 2000 Rod Bolts
Forged Flat Top Pistons -8cc
HP Rod & Main Bearings
Digitally Balanced Assembly
Hell Fire Rings

243 stage 3 heads*
Custom Precision Racing Cam
Inch 7/8ths headers
F.A.S.T 92/92
Custom true duals
M6 with 3.73 10 bolt
Plus 150 direct port shot.

Cam Specs
247/258
643/647
112+2

Built and tuned by Precision Racing