Isn't the LC9 a 6.0 liter engine? If so, then the 4l80e would be a better transmission for the swap. Regardless, you will need all the electronic components if the engine is from a 2008 donor (e.g., wire harness, CPU, accelerator pedal, accelerator cable). 2008 Chevy engines are Gen IV motors with AFM (automatic fuel management) and DBW (drive-by-wire). The AFM can be flashed off the CPU, but to make the DBW work, you will need the appropriate CPU from the truck (year and model) that the motor came from, and likewise, you will need the accelerator pedal and cable from the same vehicle. If Nelson will build you a harness from scratch, then great! That's one less part you will have to track down and ship to them to convert.

This could be a great engine to use if you have most of the necessary parts, or it could be costly trying to hunt down the right parts. Hope it works for you.