I run a stainless flex fan from Summit.My 440 is built radical and never gets over 185 even in the 90s.It runs a untouched 65 C body 22 inch rad with the small factory shroud.I even run underdrive pulleys.My kids 62 300 413 also runs a factory rad no shroud as from the factory.He has UD pulleys and flex fan also.It never gets over 190.My fan is probally over 20 years old and no problems even spinning it to 7200 at the track.My son races the 62 also.Only fan I ever had break was a factory steel one and that was 40 years ago.We both run 180 stats.No need for anything higher.Rocky