Another carb identification

On slant-6s in the US and Canada:

Carter BBS was the only OE carb from '60-'61.

Carter BBS and Holley 1920 were both OE from '62-'71 in passenger cars, '62-'73 in trucks and vans.

Carter BBS and Holley 1945 were both OE in '74 on trucks and vans.

Bendix-Stromberg WA3 was OE along with BBS and 1920 in 1963 only.

Holley 1920 was the only OE carb in '73.

Holley 1945 was the only OE 1bbl carb from '74 up ('81-up applications with feedback emission control got the electronic version of the carb, called "6145").

Carter BBD was the OE 2bbl carb from '77-'83 on vehicles so equipped.

In years and applications with more than one OE carb possibility, what was installed on any particular engine was mostly down to what fell to hand for installation at any given factory at any given time. There have been claims made in the past (and repeated often enough to look like "common knowledge") that the 170 got the "smaller BBS" and the 225 got the "larger 1920", etc.; these are not correct. The only carbs in the list above that came in only one venturi and throttle bore size for the slant-6 were the WA3 and the BBD.