If you buy a quaility fan like the blackmagic ones, it will come with a fan shroud. I use one on my 3.0 and it cools it down nicely even on hot days with the a/c running. Summit sells them fairly cheap, and they come with an adjustable thermostat, though I have mine wired directly into the ignition, so it is always on. I ran mine this way so I never have to worry about it over heating because of thermostat failure, I have scene far to many after market and oem electric fans stop working when running off a thermostat.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed