B300 -
Hope you're having a great vacation! Your carb stud is still upside down but I guess I'll have to live with knowing that somewhere in the vast expanse of the Arizona desert, there's a carb stud installed upside down..

I came across the specs table for the Holley carbs on the '78. Yours may be a little different but this is a good starting point. See attached:

Holley Carb Settings.jpg