Which fan is best for my project

I need some input on getting a fan for my project. I'm putting a 78-79 plymouth slant six into my 51 International L110 pickup and I would like to know what fan will work best. This is what I need to know which one will work better (12V electric fan, fixed fan, clutch fan, flex-type). My next guestion how far from the radiator do I need to keep the fan.
Author: flipfloppop