As mentionned earlier in the thread, the site called LS1Tech is full of infos about the LS engines, they have been installed everywhere, and they are very good too!
As for the electronics, it is plug-and-play, after your computer has been reprogramed for you and your harness (slightly) modified. The computer has to be reprogramed if only to remove the anti-theft system. Since you will not use catalytic converters, you only need 2 O2 sensors, and the computer needs to know that kind of things too. Also, the computer needs to know which trans you are using.
Plenty of companies will do all that for you; I have used Speartch a few years ago, very nice, friendly, and good! Then, plug and play! No need to plug in your laptop (that is for the guys looking for serious performance!).
As for repairs along the road, there are many shops nowadays where no-one can work on a carb/distributor set-up, whereas the LS engine will have the factory plug to read the computer and diagnose the issue...
