FWIW, if you scavenge for parts in wrecking yards like me, I'm told all Ford distributors 1957-1992 used the same inner parts and all those parts are interchangeable, even the electronic ones. There are some tricky parts made for marine engines and some MSD innards come from Ford. Only variation was the shaft OD- some were 0.457"- especially Aussie versions, & most were 0.500". After '88 or so, the bodies took a big cap directly without the conical plastic adapter. About 1981 Ford started calling the 351-W a "5.8-L". That may have been when they also stopped making the Canadian 351-M variant.
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