AFB Carburetor Question

In addition to the FSM for that has that carb, and the Carter pictured above, you can reference the
https://www.web.imperialclub.info/Repair/Lit/Master/index.htm
For an example with a single idle air adjustment screw see the 1970 Carb booklet p.6

same booklets and and films available in pdf and youtube at Mymopar.com - but no index there.