Yes, depending on the year 1920 you have there may or may not be a fuel vent line that goes to the canister.
Also, I shortened the choke rod. I reshaped it by putting a "Z" bend in it and it works great!
Since I went to the 1920 my car has never run so good. In fact it is very good! My mileage went from 18 to 22 mpg in the winter and 24 plus mpg in the summer.
One other item, do Slant Six Dan's fuel line mod and bring the line up over the valve cover from the fuel pump to the carb. The 1920 fuel inlet is on the valve cover side. Remove the old steel line, it just adds to the heat soak bad starting problem when hot.
For the record I went through (3) 1945 carb's and each one developed a vacuum leak that would not go away. I rebuilt the last one three times and had the others professionally done at $200 each time. The 1920 is much simpler and easier to rebuild if needed and much cheaper!
Send me you email and I can send a few pictures of the mod.
The main reason why 1945s are hated isn't because they're badly designed. There are many aspects of the 1945 that are better engineered than the 1920. The float system, for example (stallproof in left turns), and the overall casting design (no gaskets below fuel level). The main reason why the 1945 gets a bad rap is that these carbs were initially calibrated for emission control rather than driveability, and installed in vehicles with a lot of first-generation emission controls that seriously hurt driveability and economy. But jets can be changed, adjustments can be tweaked, and emission controls that only existed to squeak the cars past unrealistic Federal exhaust emission type-approval tests can be removed or updated as appropriate. 