To put it simply, when one either tries to rebuild/calibrate either a carb that is on an engine (if it was not swapped previously at some point) or has one that has been acquired, one needs to ID the CARB and either go into the appropriate model year WORKSHOP MANUAL, correct period PARTS MANUAL or have a REBUILD KIT SPEC SHEET to return it to stock spec and then modify to suit the application.
Same on HOLLEY or CARTER. It is just like modifying an engine, you have to know and understand what you are working with.
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Its not marked on the throttle plates. The venturi size is cast into the side of teh carburetor body.
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Not all are marked and if the ASSEMBLY ID TAG is missing, you would have to calibrate the carb to the application you are working with and then modify from there to get it to perform correctly..