Not too sure about the intake, they are all pretty much interchangeable. The later years have one fuel line in and are returnless from the engine.
It is a good idea to pick up an oil pan for the swap as well, Street and Performance makes one with a pickup tube. The pan is about $450 I think, but you don't have to take as much out of the crossmember for the swap. Saves a bit of time and vehicle integrity.
Sanderson makes a set of swap headers for the LS1 S-10, they are shorties, and I think they are only 1-1/2" primaries, but they fit and work.
The ECU can be a standard off the shelf unit, but he programming needs to be changed in order for everything to work right.
Check out currentperformance.com for the wiring and ECU information.
As for Lee's, He is still in business, he is just not making a lot of people happy right now, so his website was pulled to prevent further victims.