Cruise Seems Lean
This is the passage for the timing vacuum on your block. See if the passage is drilled through.
Then check the face of the main body opposite the white arrow. There should be a drilling there.
Shoot some carb cleaner or blow some air through to see if it goes through.
Holley's website says it should.
Holley 0-4224 660 CFM Center Squirter Carburetor
then click specs
Good illustrations identifying all of the passages and basic concepts in Urich and Fisher. If you find a used copy cheap, I think its one of the better books to start with. It does have some self promotion but still good a reference.
https://www.amazon.com/dp/0895864339/?tag=fabo03-20