Todd, I run a big 7 blade fixed fan in front of my 350. I also used a fan clutch eliminator and it is direct drive. It cools like a big dog. Throw that flex fan away. They are dangerous and won't work as well when it's really hot. In the old jeep club I was in a member of the club was killed in less than a minute when leaning over his fan and revving the motor. The flex fan spit out a blade and cut his heart in half. Go fixed blade stock type fan. You won't be sorry.
Liz, covid, murdered 10/19/21