need feedback on clutch vs flex fan and shroud

dgibby said
Good luck with the electric fans. I know lots of people have good luck with them but I could never keep mine cool.
I started with my 340, factory 2 core, tried a single pusher, tried a puller, tried duals, always ran hot. Bought the same radiator as you but a 3 core same problem with electrich fans. Switched to a factory 5 blade and 325 shroud and Hayden hot rod fan clutch. Problem solved 180-200 degrees max. Dropped in a 408 and it cools the same. I broke a motor mount and shattered the shroud so for punishment I tried the duals again and to ran too hot. Ended up with a aluminium 325 shroud from wizard cooling and back down to normal temps.
hayden hotrod fan clutch - Google Search:

1970-73 22" Mopar Applications w/ OEM Style Shroud

Success with electrics 100% depends on the fans used. there are some good ones (like the OEM designed Contour)..... and then there are the ones sold aftermarket. The flow of many of those drops into the toilet when placed behind or in front of a radiator. I rallied for years with a turbo charged Mitsubishi Starion, 275 HP from a 2.6L, and the 2 original electric fans did just fine for cooling. (Very similar to the Controur setup, with similar fat-bladed fans.)

Some are great, some are awful.