Carb adjustment

I have a single barrel Holly carb on my 62 Ford Falcon. It does not have an Idle adjustment screw. How do I set the Idle on the carb?

 

I believe that would be the holley 1904. Idle adjustment screw, that can mean 2 different adjustment screws. You have an idle speed adjusting screw, it is located on about midway up on the linkage and is situated upside down, it is in contact with the choke cam right where the cable wire attaches in that brass ball. This screw will set your idle speed as it is screwed in or out it'll change the throttle blade angle.
The idle richness adjustment is that screw located underneath and inside of where the choke cable sheath is attached, it is angled downward into the throttle base plate and has a tension spring under it. This will control idle richness, i'd set it about 5/8ths of a turn off bottom, 3/4 of a turn tops.
Hope this helps, oj

 

Do you mean you say that has been taken off and isn't there anymore?