Now I have a new stock LS1 tb from ebay to use and the old 2.8L tb. I was able to cut the 2.8 IAC houseing and fit it to the side of the LS1 tb with the help of an adaptor plate.
The IAC is in place and functional on the new tb now all I need is to get my LS1 tb to 2.8 plentum adaptor and LS1 tps and see if the resistance values are the same(as the 2.8L tps), if not I'll start fiting the 2.8L tps on there.
By far the IAC fitting was to be the hardest of the 3 to do.
The LS1 tb under all my adaptor stuff is still a stock LS1 tb, I haven't cut or drilled the tb it's self at all.
What do you think it will get me for hp?

EDIT: My thred @ F-bodytech.com