My 67, 352 had a flex fan and spacer on it when I got it from my nephew. First thing I did was throw it in the trash and take the fan blade, clutch and shroud off a doner 73 F250 I bought and put on it. This works real good except idling in this Dallas rush hour traffic so I put a electric fan I had in front of the radiator as a pusher. It pushing and the stock blade puuling at idle beat this Dallas rush hour traffic over heating.

 

Sounds like a "band-aide" system to me with more to go wrong.
.....=o&o>.....

 

Look for a Heavy duty 7 blade fan and not the standard 5 blade one.

 

I am using a duel fan set up on my 74 and it works great i have them set up by toggle so i can turn them on and off when i want, When chosing the electric fans you just have to make sure they pull enough CFM in order to keep your engine cool.

 

Thanks for the reply, I had this electric fan on a 87 Bronco II as a puller and it wasnt enough but when I put it on this 67 352 as a pusher with my stock blade, shroud and clutch at Idle in this July heat in this stop and go Dallas rush hour heat at Idle it works fine