FYI, gmpartsdirect.com has a price on that cam:
GM PART # 88958733
CATEGORY: Engine Camshaft
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $520.00
OUR PRICE: $378.56
and the specs of the LS376/480 are the same as any old LS3, except for the cam... so this should be a direct swap without the need of upgrading springs, etc.
and I dont have to pass a sniffer... as long as the car plugs in and passes the OBDII scan, I'm golden