Radiator help needed!!

In my experience, my slantys never needed much fan to stay cool.
I wonder if a thin spacer and, a shallow-pitch smaller-diameter 6-blade steel-fan would do the trick. It looks like you will have to run some kind of spacer as your fan does not appear to be sitting flat on the pulley.My 6-blade fan, as I recall, had a larger diameter mating pad, mightabin a one-piece,and may work with no spacer. I think the fan I am describing, came off my 64 273. Maybe someone has a pic.I sent some time on google but could not find a match to the picture in my head.
Or alternatively; a shallow-pitch flex-blade