Surprised no one has posted this yet.

http://www.grandprixforums.net/safely-modding-your-3800-powered-car-17482.html

Fully read through that, it offers a lot of helpful tips. And for right now I would put the stock pulley on it until you can get real time data at all times. You could be knocking like no ones business and your engine might poop on you before you get more supporting mods.