Howdy:
I've yet to see a spec sheet on this carb. I can tell you that the 1940 became FoMoCo's service replacement for 1100 & 1101s after Autolite ended production in 1969. They came is several itterations for 200, 240, 300s and for the '69 250 Carter RBS.
They are noted for rough idle and poor mileage.
If you can find out anything else on thes carbs please share the info. There are sure a bunck around.
Adios, David