I too noticed this, it fit in 2 positions. I foolishly didn't take a picture. However, I made a best guess, and it fired rite up and runs fine.Great tutorial, my only issue is, what is the proper alignment of the exhaust exciter ring? With this tool, I can have it "clocked" in two different positions. I can't seem to find any images of the proper alignment.
Maybe I lucked out, had a 50/50 chance. I also could not find any pictures or reference to this. Best of luck, its a brave world inside there.