Update:
I will be running Hedman full length headers ('98-'02 F-Body).
I also just bought a 4L65e w/converter from a wreaked 2004 GTO with 13k miles on the clock.
I sent the complete harness and PCM to
www.Wait4MePerformance.com for modification. They will edit out the VATS, rear o2's, and any other emissions crap, plus they'll setup the output for my Auto Meter electric tach/speedo and set the shift points, rev limiter, and trans shift firmness. They are also going to add a fuel pump relay and remove any plugs/wires not being used, then re-looming the whole harness. Lastly they'll install a 'canned' performance tune for 91 octane gas and my long tubes. For $350 I figure I can't beat that.