I shake my head when folks say wiring harness. But then I converted an NA harness to SC before and understand how easy it is to do.
You need
Engine or top swap parts. Top swap is usually more expensive to do.
Transmission or the HD diff, HD diff cover, output shat and one axle.
Wiring harness or one connector for the boost control and the map extending harness ~$20 from vendors
PCm reprogramming or a friend with a tuner and a six pack
That's what I've found in doing these types of things is required. As with any case you can add on or subtract some things, but the base level remains about the same.
