I have a Flow-Kooler pump on the 350 that was in my Studebaker and found it to work well. It was on the car when I got it, so I don't have a basis for before/after comparison. I will say that my model Studebaker can be a challenge to run cool with modified engines because of the limited air flow and the Flow-Kooler pump, along with the rest of a stout cooling system, did the job well in crawling traffic and pulling long hills over the Sierras at 90-100 degree air temps.

Pat