Well I decided to do the factory computer with the swap I got a harness out of a 99 silverado 5.3 got it all pulled and someone had cut the harness going to the oil level, crank sensor, and starter silenoid wire so I got the oil level sensor harness pig tail off e-bay and the crank sensor pigtail harness from oreily's I should be be able to solder a loop for the starter, I also got the fan shroud, upper radiator hose and engine mounts just need the brackets. As far as the engine I will wait until tax return, a 4L65e from daumer powertrain is $1000 and the LS3 or L92 is about $4000 there I am a little concered about using the L92 due to having to swap a bunch of stuff on it for my PCM stupid variable timing, I like the truck engines due to the fuel system and the accessories but I want to start out with something over 400hp!