race oil and how much?

I'm changing fluids on our B/PS '04 Corvette and would like to try some race oil. The engine, other than the cam and springs, is completely stock (55,000 miles). What would be a good race oil for the LS1 and how many quarts should I run? The stock capacity is 6 quarts and I've always used Mobil 1 per factory recommendations when we drove it on the street. Now that we trailer it and only race is there ET to be gained? Thanks for any advice.