I have been chasing the exact same problem in my '88 244GL 184K for the last two years and I have just about jacked up the horn and replaced the whole car until through the process of elimination and Art's help I narrowed it down to the dist. and the hall-effect sensor.
My '88 is so old and there are hardly any of the older 200 series in the yards anymore; it took me a while to find a spare for rebuild. I needed to replace a lot of the other parts since they hadn't been serviced since purchase in '97.
As to the difference in the dist. between '83 and '85-'88. The only thing that I can think of is the B23 is a much higher compression engine. The B23 also has the round plug at the dist. BTW. the '84 760 was a B23FT only offered in the US in late '83-'84.
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