I have not timed one of these pumps so allow. Read a little in the archives where the damper should be set. There is a description of the location of the timing port as well. I would search for 1985 injection pump threads.

With a mirror look for the internal item to be centered in the opening. Also make sure that the number one cylinders cam lobes are pointing upward. This you can see through the oil cap hole I think. If they are pointing downward rotate the crankshaft one more revolution to the mark on the damaper.

That said the a=b tool is more accurate if you can locate one. It basically works by sensing the position of the bar in the port and uses lights to indicate if it needs correction. You rotate the pump until corrected if required.

They are on the rental program otherwise probably might be difficult to locate one. There also is a far cheaper locking device. I guess you would rotate the pump until it would lock on observing if you are near with a mirror. Again I have not done either approach.. I think the locking tool was designed more for injection pump installation but should work.