How much horsepower does a stock Chevy 350 have in a 1994 pick up?

I have a 1994 Chevy pick up short bed. and i have about 240 stock. i have put a cold air intake on it which is an extra 30 horsepower. I also put headers on which imporved it aswell. I have flowmaster exhaust and i have about 310 horsepower.