Some other threads have this info but a stock hood without the pad on it tips the scales at 22lbs. Weight with the pad is about 26.5lbs. Going with carbon fiber is going to save you the equivalent of about 1-2 gallons of gas in the tank. There are many ways to drop weight in this car and not all of them are as expensive as carbon fiber body panels.
If you are looking to shed weight, check out the work that Doc did. He's been focused on dropping weight in his SS.
http://www.camaro5.com/forums/showthread.php?t=45165