well on a stock car I have seen 15hp-29hp. the 29hp being the vt wild or stage II cams. there is a thread on the MD. I will be trying the vt's. I just have to decide whether or not I am doing ported heads as well.
ohh I should add. those cars have ported heads. they all have headers. varying cat back. the comp270 clip is the slp loudmoth, the vt wild is dynomax mufflers, the 2760's are flows can't remember what the 262 clip had for catback.
that car is an auto also. so his hp #'s would be better with a 5 speed. full bolt on 5 speed with ported heads, cams and boltons shoudl be 305-320hp depending on combo.
I've got a set waiting to go in and I can't wait, either but I'm waiting on the guy that is installing them to get his own car done so i have to wait a couple more weeks.
BTW, the clip of the 262s above sounds like the engine is idling way high or is it just me?