I had to put this adjustment issue on the back burner for awhile. I went to California and Tomahawk but now I’m back trying to figure this out. Thanks for the help so far.
So I think I have an idea what the problem is. By the time the armature plate bracket (D) is up against the stop, I’m already at full throttle and there’s nothing left to push the carb plate to the fully horizontal (and thus fully open) position. So when you guys are saying th adjustment should be made at "2/3 throttle" or "cruising throttle", I’m already at full throttle or WOT. So why would that be? I believe I have the carb and spark properly synchronized. In the picture below, the mark on the cam is lined up with the index cast onto the block and the cam follower is just touching the cam.
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