i acually finished this a few years ago and posted it up in LS1tech but i just found this site and decided to repost it here. ill just cut and paste the info from my origanal post so i dont have to retype it.
"the wireing was easier then i thought. it is kind of hard to explain by typing but i will try. you just buy a LS1 computer, remove each pin one by one from your old 4 connector pcm and insert them in the correct location in the new 2 connecter. for example = tps 5 volt ref, black connector, pin 4, blue wire now goes into red connector pin 20 (i just made up these connectors for an example). this way you end up with all the pin locations for like a 99 camaro but the colors will acually be for a 96 truck. almost all the sensors are the same. you just have to swap the + and - for the crank sensor and relocate it from the front of the engine to the back. the TB and injector wires have to be extended (you will have to buy 8 injector connectors). you will also need to install one harness from scratch for the 8 coil packs but thats it.
on the acc. i just kept it very simple, i just used all the stock 96 ones. you only have to make 2 simple brackets. one for the left and one for the right. you just got to get the stock brackets to bolt up flush to the heads. then if you use a crank pulley and water pump for a 5.3L truck, the belt will line up (custom lenght of coarse). its complicated but simple.
then just make some engine mounts, use a 6.0L truck flywheel, drill it for a small bolt pattern, use a truck intake to clear your custom belt system and your done. for the exhaust, i did not care for headers so i just used stock manifolds and y pipe for a 6.0L SS truck and it fit perfect. after the y, i used a single borla muffler and a dump. with the manifolds and cat's it is very quiet.
this sounds like alot of work but it is (i believe) the cheapest way to do it. on the motor, i used a completey stock 99 LS1 out of a low milage vette, LS6 cam and springs, and stock unported 241 castings. i dynoed it before and after also. HP went from 175 to 285 (110rwhp gain). i also lost almost 200lbs off the nose, gained MPG (17 to 21 on freeway), and gain 2000 rpm (the vortex would drop off fast after 4k but the LS1 pulls to 6.2k easy). i love it but i did lose about 30 or so RW torque below 3500. i really feel that when i am towing but this i mainly a fishing truck so that is ok."
here are some pics. keep in mind that i only use this truck for fishing and mudding so the motor is dirty and never washed.
http://i162.photobucket.com/albums/t...che/96ls19.jpg
http://i162.photobucket.com/albums/t...che/96ls18.jpg
http://i162.photobucket.com/albums/t...che/96ls17.jpg
http://i162.photobucket.com/albums/t...che/96ls16.jpg
http://i162.photobucket.com/albums/t...che/96ls15.jpg
http://i162.photobucket.com/albums/t...che/96ls14.jpg
http://i162.photobucket.com/albums/t...che/96ls13.jpg
http://i162.photobucket.com/albums/t...che/96LS12.jpg
http://i162.photobucket.com/albums/t...che/96ls10.jpg
http://i162.photobucket.com/albums/t...ache/96LS1.jpg
http://i162.photobucket.com/albums/t...e/DSC02131.jpg
http://i162.photobucket.com/albums/t...e/DSC02109.jpg
http://i162.photobucket.com/albums/t...e/DSC02105.jpg
http://i162.photobucket.com/albums/t...e/DSC02081.jpg
http://i162.photobucket.com/albums/t...e/DSC02080.jpg
http://i162.photobucket.com/albums/t...che/IMG002.jpg
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