I installed one of these (mine is a 6 fuse) where my battery should be.
Picked it up at oreilly's and built some nice supply wires. Double crimp with shrink tube.
I ran a few new wires into the cab. One carries +12 in on a heavy gauge wire, 1 is from the Ignition circuit. I added two relays (one for run and one for crank) and eliminated my fender mounted solenoid (My ministarter has one built in).
I did most of this when I installed my duraspark system (which is AWESOME compared to points BTW).
I plan on adding a circuit for an electric fan but right now 2 of the 6 positions just hold spare fuses. My car is built to drive, not really for show.