Chuck - I found this information on adjusting the divorced choke rod on a Holley 4150 carburetor:
https://books.google.com/books?id=_fTHcnYMyywC&pg=PA76&lpg=PA76&dq=adjust+the+divorced+choke+rod+on+holley+4150+carburetor&source=bl&ots=XIvAO1nn5m&sig=ACfU3U1UwnGZbSdSAebvVwdZPv4yrBAOsQ&hl=en&sa=X&ved=2ahUKEwiWuuymopqEAxXPI0QIHT4mBaE4ChDoAXoECAMQAw#v=onepage&q=adjust%20the%20divorced%20choke%20rod%20on%20holley%204150%20carburetor&f=falseIn the Ford 1970 Car Shop Manual, there is a procedure for the Holley Model 4150-C 4-V Carburetor on page 23-06-02 "Choke plate clearance and fast idle cam adjustment."
1. Remove the choke thermostatic housing cap.
2. Place the choke plate in the fully closed position by opening the throttle level to about 1/3 throttle, and press down on the front side of the choke plate. While holding the choke plate closed, release the throttle lever.
3. With the choke plate in the closed position, measure the distance between the flat of the fast idle cam and the choke housing mounting post. If the setting is not to specification, straighten or bend the choke rod to obtain the specified clearance.
4. Bend a 0.036 wire at a 90 degree angle approximately 1/16 to 1/8 inch from one end. Insert the bent end between the lower edge of the piston slot and the upper edge of the slot in the choke housing. Open the throttle lever to about 1/3 throttle and rotate the choke lever counter-clockwise so the bent end of the wire is held in the housing slot by the piston slot with light pressure applied to the choke lever. Measure the distance between the air horn and the down side of the choke plate. If the setting is not to specification, bend the choke lever to obtain the specified clearance.