OK. I'll step in it. Electric fans work great in new vehicles. The engineers go to to great lengths to design the front of the vehicle, and use a fan specifically designed for the vehicle to make them work.
Just slapping one on a 70 year old truck may or may not work. It is very likely that the best case scenario will be less than optimal, but not detrimental.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission