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+1 on the NGK B6S.
Knowing the effort you put into motors, Jim, I’m sure you’ll give the ignition a full check. When I got mine the coils were great,and the points cleaned up easily, but the condensers were toast. Those condensers were a little though to track down, but I got lucky with finding a cheap set on eBay.
One more check I’d recommend, but it will require you to pull the powerhead. There are two idle relief tubes that are under a cover plate below the powerhead. The tubes direct exhaust out the two square ports toward the backside side of the tower/leg. The relief tubes are some kind of plastic/plastic-like material with small holes drilled in them, and on my ‘68 the tubes were completely melted shut, preventing the proper exhaust relief. I removed the melted tubes and replaced them with copper (I believe 1/2” diameter).
JP