That's the stock fan, isn't it?
When it come to cooling engines (on any make or model), everyone thinks you have to replace the crankshaft driven fan on the water pump with a flex fan or a 5 or 6 or 7 blade fan, or an electric fan or whatever. In my experience, the manufacturer usually got it right with the original design. Those solid metal, offset 4 blade fans found on most engines of the 1950s do the job perfectly well.
