without tuning MAYBE 10HP
and thats a big maybe

springs/retainers = rev high

but with the stock intake manifold it will choke out ur cams and u only make power till about 7500 or a tad less
change to a skunk2 mani and make power over 8k

pulleys are a waste of money
and untill u tune the gears and the air/fuel the cams arent gunna help much