I used s 16" SPAL fan that is rated at about 2350 if i remember right...it is not their standard 16. This is used on a 350 v8 in a 50 chevy truck and is the only fan. BTW it is a puller type. Can't say for 100%, but i've been told several times that pullers are more efficient than pushers...?....
My concern was to cover as much of the radiator surface as possible...so i used the largest diameter with the thinnest profile. Cools great.