So you back in the land of the free and the home of the brave? It is in fact running. 175 miles on it to be exact. It is running good. After some research and a very helpful conversation with Mike Norris it was determined that it was plug and play! I have to give props to Mike, I was willing to have him do a reflash, but he said unless I wanted every last drop out of it I didn't need to do that. He said there would be no problem as far as hurting it.
It did take a while, as you said the head problem had to be corrected. That turned out to be challenging. It seems a lot of the parts that are part of the stock LS6 cylinder heads are being discontinued by GM. I was able to get a new casting from GM. But, the number one intake valve was bent. I am assuming this happened in the accident that took the Vette's life. This is where the problem was. GM has discontinued that valve. It is hollow and very light. So, unless I could source a new one, I was going to have to disassemble the other head as well and replace all the intake valves. I had been working with PACE performance on all these parts. I can't say enough good about them. Chuck Fitch the manager is a great guy. I recommend anyone dealing with them. He went to GM powertrain direct and struck out. Just when I was going to pull the trigger on taking the other head off, he called and said he found me one. Katech had it. So after a couple weeks of looking I had the valve and got it back together. Then as you may or may not know, to change the engine in a 4th gen it has to come out the bottom. Yea, what a pain without a hoist. So since our shop has an exploded truck all over it, I made arrangements to have it switched at a local shop that does this stuff. That took 2 weeks as racing season is getting into full swing here and he was backed up. In the end, I got it back this past weekend and have been going back and forth to work this week. So far so good. It definitely runs better, but I think there might be a tune in the future as I think I am leaving ALOT on the table with the stock ecm. That will be way way down the road. I have to recover from this. This is just a daily work driver and was an unexpected expense. Thanks for offering the engine up buddy, my search around here was yielding nothing. Very please, plus I learned alot about the LS stuff along the way. Ill be in touch, I was waiting till your whirl wind tour of Italy was over. Hope you had a great time.!