As you can see, the bellcrank on the center carb doesn't do anything on the far side - the lever hole is empty.
I'm not convinced that this is how the links are supposed to be attached.
I've seen others (too small and grainy to post) which had a simple 1-2-3-pedal straight linkage with a sliding stop to the cross-over bellcrank (so it doesn't move until part-throttle) on the driver's side, and 1-bellcrank-3 on the far side, with shorter arms (for faster action) than the driver's side.
