You don’t want to pull the driveshaft out of a ’66 model as it is one piece unit with a key on the end driving the pinion. If it did come out, you’d have to split the gearcase to get the pinion properly lined up on the end of the shaft. It just makes for extra work.
’79 was the year they came out with the splined pinion and small water pump. The new replacement 763758 kit can be used on motors right back to at least ’54. The P/N for the impeller itself is 0763735.
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