Electric fan????

Is there a writeup on how to do the swap? I'm interested in it for the mileage gain.
I used this one as a basic guide and a Hayden adjustable controller.

Since my Dart had a little four-blade fan with no shroud, I figured a smaller (and inexpensive) fan would work. Found one at a junkyard from a mid 90s Toyota Corolla for $25. So far it's been working fine. I can always install a bigger one later on if needed.