Jim, I'm pretty sure I got the throttle and carb linkage position figured out. I'm going to do 2 things;
1. I'm going to make sure the arm is in fact keyed to the rockshaft. It's that engineer thing.
2. Then I'll adjust the yoke and see if there are enough threads. If not, I'll make more threads as you suggested.
Why would anyone put the wrong carb linkage on? Rhetorical question of course.