Mr Ian, I agree with Mr Ren about an electric fan with a shroud.
You can get one from the junk yard, just have to look at the shape of the shroud.
I believe some have used Ford Taurus fans and shroud, not sure what years.
You can also get a Flex-O-Lite Black Magic Extreme .
I have one on my 93 5.0 Mustang and I put one on my 72 truck as well , it has a 429 but I don't see any reason it would not work on your truck as well.
It comes with everything needed to hook it up including the shroud, electric fan, wiring, adjustable thermostat switch control.
I adjusted switch to come on at 195*.
It is very easy to install.
Check before you order but I THINK it is model 185 ( I am not sure if that is the correct #) , it is the one for 1979-1993 Mustang, 15" S blade fan, 3,300cfm.
My fan only comes on if I sit in traffic or long periods of idling or pulling a heavy load.
Good luck which ever way you decide to go.
https://youtu.be/0vRZFH_r5q0
https://www.flex-a-lite.com/direct-fit- ... stang.html