1920 Holley carb question

Hey . SS Dan is a standup guy and know his schtuff about slant sixes. Good luck! My two cents is if you are turning the mixture screw in and out and having no change in idle that carb has vaccum leaks a plenty. Could be a pourous ( I think I spelled that right?) casting. This will cause you nothing but headaches. Truth is if the carb has been poked around with a few times its pretty much time to get a new one and use that old one for a sinker next time you go after salmon or big channel cats.
Chas.