I'll see if this helps! With the truck off and dead cold, the choke plate looks like this
I replaced the choke pull off already. The one in this picture was from my Corvette's old Quadrajet. The arrow points to the lever/arm that moves with the throttle linkage on the Corvette Quadrajet, but not on the truck's.
Here is a bit better picture of the overall choke setup, in case someone sees something I'm missing.
Last but not least, here is a video just after shutting the truck off, so show what it is and isn't doing. The truck only ran for about a minute.
https://youtu.be/0aUzYWbRLhs