I got mine off ebay. The guys selling it sold his VH and didn't need it. I just happened to be at the right place at the right time. I got the wiring kit to suit the car and engine conversion, an electric speedo and the BCM eliminator for under $800 posted. would have cost me almost double to buy it direct. I had also looked at getting an auto electrician to do it from scratch and that would have cost over $1K plus the $ transporting the car there and back.
There isn't much to it if you're mechanically minded. I have little idea of the cars electronics so didn't want to gamble trying to figure it out myself. In addition to this, the engine is out of a VR with electronic transmission which i've heard is more involved compared to a VN-VP 304.