So after replacing and checking every part of the cooling system, I finally got a replacement raw water pump from the Netherlands (AB Marine Service) and was able to install it last weekend. It was not a drop-in replacement for the Sherwood (as advertised) but I was able to finagle a way to install it. I am overjoyed to report that it seems to have fixed the problem. Water is coming out the transom and the engine temp was normal for a 20 minute run around the harbor. I still do not entirely understand what was defective about the old one. I put in a new impeller and it looks OK in general, but for some reason it was not generating sufficient flow or pressure for the cooling system to work correctly. Finally, back to sailing! Thank you for all the input from the list. Dave
David Knecht S/V Aries 1990 C&C 34+ New London, CT 
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