They gave you bad advice. with dual pushers on an aluminum radiator, you wouldn't even need the mechanical fan (although it's nice to keep it there - big iron engines make a lot of heat and it helps to have something to blow it out of the engine bay).

Think about it. going down the road on the highway, the wind acts as a giant pusher fan. you don't need the mechanical fan, then. all that stuff is there for when the car isn't moving or is moving slowly.

the single auxillary pusher fan will be a big help