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My '74 had this problem and the way I cured it was to fix the leaks as well as keep the engine spotless.
For cleaning, I spray cleaner in thru the fan, with the engine off, and let it soak in. Then with the engine running, I spray the hose right into the fan and it forces water onto the engine fins. This does a pretty good job of cleaning the engine and I've been told that this is a method used on the race track.
I recently removed my CIS and did oil leak maintenance. I was surprised to see oil was leaking right out of the low-oil-pressure switch that is on the top/back of the engine.
My next cleaning project is going to be getting some wire type cleaners (like pipe cleaners) and scrubbing between the fins from below. I suspect that there is ground in and stuck grime.
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