When I discovered the Ford drawing, I timed a Model 40 type distributor as it shows (just like your drawing) and then verified that as same result obtained with KRW fixture. Then I got out one of the aftermarket fixed slot timers, the paddle shaped type, and noted that it achieved exactly the same alignment as the Ford patent one...and, of course, you really need only one ruler, great for those of us on a budget...
The Four hole distributor aligns same way and has the same pattern of three as the earlier...the extra hole is for 60 and does not affect the pattern used on 85.