The LS1 swap is really the way to go. Modify your existing spindles, cut down your rotors to create a hub, and mount the LS1 rotors, abutment brakets and adapter bracket and your in business. I did this to my Monte Carlo front brakes, and it worked out awesome. You have to go with 16" wheels at least for the caliper clearance. Listed below is a url address you can see the details, or just Google LS1 G Body brakes and there is lots of good info. Good luck!