A mess because it uses a huge fuse box for a handful of circuits (good luck finding room for that in the engine bay along with the other 3 FD fuse/relay boxes), every part of the harness is too long... like there's 8" for every injector, so it just looks like a rat's nest sitting on top of your engine. There are no transmission controls, so you'll have to make your own reverse light, reverse lockout, and speedometer circuits, all of which are not -and cannot be- controlled by the PCM, which can't be rewritten....
Also, the PCM they send is not assigned a VIN, so it's not a Corvette, Camaro, or GTO PCM, it's a proprietary GM Controller, and HP Tuners & EFI Live don't sell credits for cars that never existed. Good luck on the dyno.
And, since it's a proprietary PCM, it uses a different pinout than any of the other common GM cars. I spent a few days trying to get the pinout from the distributor, then another couple of days getting it from GM performance parts. Good luck if you ever need to trouble shoot it.
