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An obstruction over a very short distance has little affect on system flow. You have two thermostats on a flathead vs one on most large OHV engines, they are capable of maintaining proper flow. The engine was designed to work with thermostats.
I've never seen slowing the flow down helping with high temperature despite the stories from the 50s about installing washers or removing vanes in the pumps. Now days everyone seems to be moving to the higher flow pump designs.