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I thought '68 was the first year for the sm465, at least that's what I've read a few times, and my '68 has one. I'm sure there were still several '68s with sm420s though, so could be either.
Sorry, it is a 465. For some reason my computer only displayed the first photo. Another identifying feasture is that the 465 has two PTO openings, whereas the 420 only has one on the driver's side on the case. I stand corrected.