Yep, like scooter said.
Put the engine in first, then wire it.
If you are keeping the truck semi-stock, it's really easy.
I installed this:
xxx
they used to sell a gv-8, which was half the fuses (8), which would work for an 80.
All the wires are labelled, so you simply install the fuse panel & run them where they need to go, and splice them to the lights, blinkers, & what not. (it can be overwhelming when you start out, just take your time & do a few wires at a time. I'd suggest getting wire loom for everything in the engine compartment.
Xxx works as well.
Ask Jeff here if he sells their kits or similar.