I installed a 12" Kenlowe fan with 10 shrouded blades I bought in 1991 in England while there on a business trip. I use it as a pusher fan. It is mounted in front of the rad, high enough to still permit me to use the hand crank. I wanted to keep the look of my early 1958 TR3A as "original" looking as possible for the judges so I still have and use the original fan which, I have heard, is essential at a dampener to prevent your crankshaft from breaking.
I had to trim a semi-circle in the cardboard air deflector above the centerline of the fan. This air deflector surrounds the rad to direct all the air flow through the fins. This semi-circle I cut is for clearance so the fan blades don't stick, drag or scuff on the cardboard air deflector.
I made the supports for the fan and these are secured to the side frame of the radiator.
I haven't noticed any overheating when I driving faster than 30 MPH but if I stop for five minutes, it starts to heat up quite quickly and so I flip on the fan manually with a switch just under the dash (almost out of sight) through a relay because the fan draws about 25 amps to get it started. Then the needle on the ammeter steadies out at about - 10 amps. The fan can drop the temperature on the Temp Gauge from 215 deg. F to 185 deg. F in about 3 minutes. Then when I get going again, I flip off the fan.