welcome aboard, I can suggest a few places for aftermarket products for ya....
www.highrevmotorsports.com - sells kits, performance, suspension, just about anything you could want..
www.j-body.org - gives somewhat useful info on how to do things, just be cafeful about posting they get flame happy..
www.rksport.com - kinda pricey but a good selection
www.tabascoracing.com - a few good items, really reasonable prices