I have used flex fans before with an aluminum spacer (move it into the shroud) to eliminate clutch and cooling problems, it does cost you a little bit in MPG and is louder. Absolutely use a fan shroud.
I used an electric fan in lieu of the engine driven fan and it was not enough. But, at idle this as a pusher fan might be enough to keep you from over heating at idle when installed in front of every thing else. If you have an automatic transmission, used with an external cooler with fan, that will help drop a lot of heat and is better for the transmission.
This fan I used is thin enough to fit about anywhere.
12” 8.8 amp cont
800 CFM free air flow
675 restricted air flow
Prepper - im going to not just upgrade the fan. it runs pretty hot on hot days, even going 60 consistently. My water pump and fan clutch came in today, im going to install it and remove and flush the radiator both ways when i do it and if that doesnt fix it i will do the 4.0 rad swap.
When radiator is out do the "Flip test"
Stand radiator up like it sits in the vehicle
Put hand over lower rad hose outlet
Fill up rad via upper rad hose outlet
Remove hand over lower rad hose outlet, water should drain out instantly, rad cap open and upper hose open lets in plenty of air
Now FLIP RAD OVER, upside down, NO WATER should come out
If any comes out it can have only come from blocked passages that couldn't drain
You can lay rad flat and fill it with HOT water and vinegar solution, let it sit for 15min, then flush
Repeat as you see fit
Do Flip Test again
Clogged passage will eventually rust out and leak because there is no coolant circulation so NO rust protection from coolant additives