What year has the most horsepower for a stock 350?

The gross h.p. rating of 370 for the 1970 LT-1 engine in the Corvette was the highest advertised. However, because of a different rating system used after 1971 (SAE net) the 2004 5.7 liter (actually a 346 ci but GM still calls it a 350) LS1 engine in the GTO, which was rated at 350 h.p. would make the most actual power.