A teacher of mine had over 2k on stock alt in a monte. He had a few kinetiks in back though, dont recall the size, but he said he never had any problems. Now i dont know if his alt did or didnt shit itself early in its life, but i can say his lights werent dimming even at idle. Very least, get some bats, when the alt dies, go to a H.O. Alt.
And dude, like stated somewhere above, you cant run a 16v batt on a stock alt, wont charge.