More and more hot rodders are looking to the LT1 and LT4 engine packages for swaps into their classic iron. The most modern generation of small block Chevy contains more technology and more horsepower per pound than any before it so the swap makes total sense. The wiring end of the project can get weird if you are trying to hack the complete harness out of a late model car so there are far better ways to get that handled. One of the best is with Howell EFI. Howell EFI has all of your LT1/LT4 needs covered with wiring harnesses for engines that are getting hooked to automatic transmissions, stick shifts, and all in between.
The company has offerings for EcoTec3 engines as well if you are going the four cylinder route. These guys have been around for decades. The company was founded by and run by former GM engineers who understand the platforms and the technology on a molecular level. They also understand the needs of hot rodders and the aftermarket consumers buying their product.
If you are making an LT1/LT4 swap happen call Howell EFI! Better yet, check their website out by hitting the link below.