This is the contact to the guy in Texas. His Name is Richard. Tell him what mods you have and what kind of feel you want for your car and he can make your clutch. I think hes the only one who doesnt use the LT4 pressure plate. McLoed centerforce spec and all the others use the LT4 pressure plate.
http://www.clutch-shop.com/
254.752.4307

Carolina Clutch Carries LT4 clutchs for $295. Cheapest Ive found. I forget the guys name but the head guy who deals with f-bodys and vettes really knows his stuff too.. Dont bother talking to one of the sales guys unless u know exactly what u want.
http://cc.aspartner.com/
1-888-462-2739

Sam Taylor Buick- They have the lowest price on the LT4 hot cam and some GM parts. I dont think they have the lowest price on the flywheels though. Ask for Jason in the parts department
1-877-726-8295
gmparts@samtaylor.com

Vandevere Pontiac
Ask for Dal. He gets good deals on parts too..
1-800-362-9494
lockitup@bright.net
autooutlet@vandevere.com (his work email)