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Do you see the cast iron hold downs that keep the metering pumps in place on the side of the engine? Very similar concept to what's up top for the injectors. You will want to take the roof off over the engine for this. The screws over the radiator and elsewhere screw into captive nuts, just...

Take the hard line on the problem cylinder, off the metering pump and see if its pumping fuel while running. If it is, as Ray points out, look to the injector next. That can also be tested installed, but removed from the head with the hard still attached. You will want to figure out what isnt...

You want them as close to the pushrod tubes as you can make them go... but uniformly across all cylinders.

Fuel Stop Solenoid

I would unplug the FSS while running, and see if it shuts down in the same exact timed manner.

He could have a sticky IP or two as well, holding up the return movement.

The droop adjustment, in my opinion, isn't in play in this problem right now. Can you take a photo of the rotating plate on your engine, which the frequency adjustment cable ties to? Can you visually see this part rotate, when you move the star wheel up front back and forth... or does it stay...