> TDM ? Big Blue Book ?
TDM == Technical Data Manual
BBB == "Passenger Cars Starting August 1959..." service manual.
And I have a BBB here on my desk. The relevant page is job 00-0/12, which is a table of the details that make the 220S, 230S and 250S zenith 35/40 INAT carbs unique to each of those models.
-CTH
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