You may gain a little just because gm847's specs are a tad bit more aggressive, but I dont think you will be able to feel it. If I were you, I wouldnt go to all that trouble just to gain a couple of hp. IF you do another cam swap, I would def do like the rest and go custom grind. There are many places that will custom grind you a cam for not much more than an off the shelf cam.
EDIT: I dont know what other mods you have, but that money can def be spent elsewhere. ie suspension, gears, stall is auto...and the list goes on. Its been said before, but HP isnt the only thing needed to be quick!
Last edited by sam95transam; May 6, 2007 at 09:49 AM.
Reason: Adding more info