well for some performance on a 3100 i suggest hitting up
WOT-Tech: 60V6 Performance they have plenty of parts such as camshafts for turbocharged or N/A, manifold pieces and i do believe this site might have something for ya if your car is a j styled body.
OverkillEngineeringMotorsports.com . You can get a full upgraded ignition with MSD blaster packs, Taylor Spiro Pro 8mm plug wires and NGK iridium IX plugs, take off the EGR Valve covor lines and put air breathers on them, you can register on
The BEST Source For All Your GM 60ºV6 Needs and find a guy with the name GPchris, ask him about a downpipe that kills the cat. on OEM they can get you a set of custom headers built but will take some time to make. from WOT TECH they can program your chip to turn off the EGR, i believe tey can even work with some shift points, top speed, idle RPMS... etc.