Problem with Holley 4 bbl

You got somethin WRONG. There's no way in HELL that cam is not pullin more vacuum than it is. Maybe a wrong gasket in the carburetor....internal vacuum leak or somethin.....Hell, my slant 6 pulls more idle vacuum and it has [email protected] on a 108. Let's go the direction Bewy was.....are you running a PCV valve? If so, yank it off and plug the port where it's plugged in....and that IS in the carburetor, right?
PVC is connected to the throttle plate port on the back of the carb and gets full manifold vacuum.