Holley/Demon Carb stumble

first verify that my artwork is right.
#8 is MAB......?
Help me to understand all the rest of them holes/numbers between my fuel and air red circle.
Numbers 22,23,24,25
upload_2019-7-24_18-23-22.png
THIS IS NOT MY CARB! IT'S FROM A BOOK OF THE 80'S