I would look at a bolt on Vortech Supercharger rather then a turbo, at least as far as ease of install and reliability. I havent seen a turbo "kit" for the 4.3, everything I have seen has been modded from something else to work, and there is a lot of tinkering to do to get it all right. A Vortech would bolt on and be designed for that engine.
But yea, there are forums all over the place with people that could better answer your question, as I am sure you know. Good luck!
But yea, there are forums all over the place with people that could better answer your question, as I am sure you know. Good luck!