[LS short box]

A little hard to explain but I will do my best. The Painless fuse block doesn't fit the stock 68 fuse block hole. It's bigger. So as I was trying figure out what to do with maybe a cold one in my hand!
So what I did was move fuse block (front and back as a unit) back just enough so the wires going to the front and back could be routed thru the firewall using the Painless supplied round grommet.
There really isn't that many wires. The complete Painless fuse block has two mounting bolts that typically go thru the fire wall. In lieu of that I made two "L" brackets that used those two bolt holes and then using sheet metal screws I screwed into the panel up above and in front of the stock air vent hole. I was able to hide the wires behind the wheel well. Both front and back wires follow the frame rails.
Sorry no pics.