Kevin,
My bad, kind of hard to tell what they are at that age. My youngest daughter is 46, and have a son 2 years younger than her.
This may get a little long, but I decided to post for educational purposes and in case I need to be corrected.
Spent the afternoon out at my friends place. he has 6 215/223 engines there. It seems there were 3 different setups used.
The first, after much discussion we felt this was the type your pickup should have. This will be starting from the throttle arm on the firewall were your cable is attached with a bolt. Mounted in that hole, there is an adjustable link that is about 8 inches long and provides fore & aft Movement. Now looking down at the carb mounting studs on the top of the intake manifold, you will see 1 on the right side and 1 on the left side. Looking down at the right carb mounting stud, you will see 2 more studs, 1 to the front and 1 to the rear. These are 2 of the 3 studs that bolt the intake and the exhaust manifolds together. On these 2 front & rear studs is mounted a bracket that provides a pivot point for a bellcrank that changes the fore & aft movement to a up & down movement. 1 of the arms of this bellcrank is connected to the longer(about 8 inch) rod which comes from the throttle arm on the firewall. On the other arm is mounted a ball stud. Connected to this ballstud is a short(about 1 inch) link that has a ballstud socket on each end. The other end of this short link is onto a ballstud which is bolted to the butterfly operating arm.
My pickup is a 62 and has the later series head on it with the 8 bolt valve cover. I think the manifolds are the same and are interchangeable. I could be wrong. The setup is similar but different in that it mounts to the 2 holes in the cast tab that is on top of the intake runner to the rear cylinders. This results in a different length links, but accomplishes the same change of movement. We think this setup started about the same as the body change.
The next type mounts to 1 of the holes in the cast tab on top of the rear runner. It seems somewhat simpler and a lot less sturdy. We think it was used on cars as it would not receive the abuse that a pickup would. It did accomplish the same movement change, but it did seem very flimsy.
Another thought on this. You said earlier that the PO had done some changing and/or welding on the carb butterfly arm to make the cable work. If he removed the ballstud and somehow made it so the ballstud could not be installed in it's original position, you may be better off to keep the setup you now have. Unless you have reason to change the carb so you could go back to the original type setup. This is something you will have to decide.
If someone has some differing thoughts on this and these descriptions, please chime in.
He said he would need twenty dollars plus shipping for whichever setup you would want. My preference would be for the later one like on my pickup as it seemed to me a little smoother operating, but would not be original. He has all 3 setups on different engines so would take off whichever you would prefer.
Let me know what you want to do, and if you can even go back to the Ford system or if the PO has "doctored" it so you can't go back.
Fred