You guys are killing me. Just because the Camaro received a LS3, the same engine nomenclature that went into the Corvette, it does not mean it will duplicate it's power output. There are too many variables. Exhaust efficiency, factory tune, cam profiles, etc. could be, and probably are, diffrent between the Corvette LS3 and the Camaro LS3. Also, atmospheric factors play a big role as well as mileage on the engine at the time it was dynoed.
Those numbers are great, even if they are less than what others have gotten with the same engine in a Corvette. Geez, just be happy you have a Camaro available to buy at all.