Ok, a little update.
Talked to Greg and his lovely wife while they were making the 7 hour drive home from Arrington in their hot rod.
Greg got the Arrington 5.7 based 392 forged motor, and had them reinstall his Vortech supercharger. With the pulleys he had for the supercharger he ended up at 6.5lbs of boost.
I think he told me the numbers were 530RWHP and 580RWTQ, but I'll let him update that. He did say he can definitely feel a HUGE difference in the torque the car has over previous.
Congrats on the hot rod Greg!