[rs72z]

If you aren't going for the show car look under the hood, the easiest way is to use the under hood fuse block from the donor truck. It's a 3 wire hookup...12+ constant, 12+ switched and the fuel pump hot. Then there is one wire to the trans that has to be moved in the fuse block. Pretty simple.
I used the factory covers for the fuse block and mounted it to the fender.
I also used the drive by wire and hooked up cruise.

I also did a swap in a 55 nomad and modified the stock harness myself following lt1 swap.com. It's not hard just time consuming and be careful and don't accidently cut a wire that your not supposed too. Don't ask me how I know about that.