Thanks for all the good info folks. I finally broke down and paid for a good tune on my LS1. This was not a dyno tune, but rather the tuner rode around with me with his laptop plugged in for about two hours tweeking everything from shift points to fuel, to timing and AFR. The cars was fast and fun before, now it's even better. It's actually hooking pretty good, I need to try Techs trick with the shoe polish to get the right tire pressure. We'll see how it will do at 4500 feet next week. I know now that I need to figure out a way to get cold air to it though.

Pat