I think you might be right, I was doing some searching of my own, and they used something similar on the 5.0 in the fox bodies as well. Best I could come up with was "Electronic Crankshaft Position Sensor" which seems to jive with what you're saying.I believe they were for the factory and dealers to plug a sensor into to detect the notch on the damper, and set the timing.
It is not much of a diagram - just a line drawing showing the hole in the pointer and line to the correct port on the 820.Can you scan that figure in?
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