I've attached a couple closer photos of the carb on the truck. I think the bracket is on the right way and the throttle cable does point downward. I can see a small hole in the foot throttle control rod in the second photo. Is that the hole you are referring to for the cable from the throttle control knob? One of these days I'm going to figure out how to put those little arrows on photos.
The major difference I'm seeing between the 2 linkage systems is that the one on my truck does not have a hole into which the rod that is in the throttle control linkage can be put. In the photo I attached in the last post there's a hole to the right of the mounting screw. On mine there is a flat head screw between the mounting screw and the attachment point for the choke cable. Do you know if that is normal for a manual choke carb?
I'm going to flip the piece that is supposed to be connected to the choke linkage around in case there is a way to connect it.