The kill bleed is behind the vacuum pot. Remove the front pot, and you will see a small hole horizontally intersecting the passenger side
Venturi. Take a piece of tag wire and run it in to this passage and you will see it enter the Venturi.
Rear carb has one as well. Not uncommon for people to press a BB in this passage.

Stock carbs do not have a plugged kill bleed. The opening in the Venturi is usually much smaller then the opening just behind the pot.