Interesting that the clutch fans are breaking down so quik.
Thought to do that setup for the original look. What brand(s) are you dealing with?
For what it's worth, a couple of years ago I had cooling problems also. Went out and replaced everything, radiator, heater core, (both Modine OEM style), water pump, etc.. even a new flex fan an it fixed the problem. Small block with the big radiator though.