The upper left hole goes to the Hi alt control. The one on the lower left goes to the slow idle jet and adjusting screw as well as the small hole in the top of the carb by the main metering jet, as can be seen in the emulsion tube removal photo. The port on the right goes to the emulsion tube/main jet.
Now that all is super clean reassemble the carb. Be sure to put a new O ring on the emulsion tube. A touch of oil on it makes it slid back in place easy. The tube is fully seated with the main jet.
Set the float height to proper setting. This setting is measured from the lip of the carb body, not the gasket seat.
The setting for a Four screw square carb (used on early K1s) 1s
The setting on the two screw square bowl carb is .78in/20mm. It's 21.5mm for the K0 carb.