Us old folks are stubborn. We'd rather spend time than money, lol. Besides, it was working fine until the engine just stopped spinning, which wasn't fuel related. Anyway, I'm going to keep plugging away.
I've reassembled it to see what could be missing from the linkage. I've also been looking at lots of photos of Rochester single barrel carbs. I haven't come across a photo exactly like this one. But when I put it together, including the bracket that holds the manual choke and throttle cables it appears that there should be a spring between the throttle linkage and the choke linkage. If you look at the throttle linkage there's a hole in the fixed part of the linkage (if I could figure out how to put arrows in pictures I'd do that but . . . ) If you go straight up from that hold there's a lip on the choke linkage. (In the larger photo of the choke linkage it's just above the last "R" in Rochester. A return spring there would pull the choke open unless the manual cable pulled it closed. The other part of the choke linkage, the part right under the screw, seems to allow the butterfly to move slightly when the choke isn't fully closed or open.
If anyone out there has one of these carbs could you confirm that the spring is missing or any other parts that you might think should be there.