I wasn't able to locate the oil plug on the rear of the head that you mention. However, there is an elbow screwed in at the rear of the head which has a very thin steel tube leading downwards to the side of the block on the LH side. (My shop manual doesn't show that connection, and I don't know what purpose it serves)
I'd like nothing better at this point than to have an oil pressure gauge, but I spent literally days trying to unscrew the oil sensor, with absolutely no success. It is well and truly frozen in place (not to mention the bucks I spent on different types of wrenches hoping to loosen the thing.)
As soon as I can get to it I plan to remove the valve cover and see if there is oil escaping when cranking the engine.
Thanks for re-sending the static timing link, which I am saving for future use.
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