stock fusee block
You well need to get some correctly colored wire, some new terminals, a Terminal tool(small screwdriver like) and a crimper.
If your fan relay are already there on the box, 1/2 the work is done. You just need to wire power and PCM/ECM relay activation wires as needed.
Get a wiring diagram for the setup you are using or want to wire like, that well help..
I have posted this before and is in my LS1 Nova build thread. Here is a drawing of where fuse and relays are located and logically wired (not physically correct or to which terminal of the relay). But the Fuse circuits can be seen correctly for what goes to what and from what). Which were pretty much as stock.
These may help.. but depending on what you have or need.
Fuse Box lay out and some wiring:

What I figured I needed for pin out from/to PCM, fuse box and other items:

BC







