Interesting method

I'm not thinking I will drill my block though! I'm working on an offset bolt, and if that does not work out, Then Ill likely go with modifying the existing bolt and getting the offset through sleeves that will be drilled off center, to match my lash adjustment. Any local machinist should be able to make me a few of those so I have some spares. Thanks for all of the information! This place is a wealth of knowledge and helpful folks!
Edited to add: Does anyone have a picture of the base, dial indicator, extension rod set up on their engine? I follow how to get the measurement, but can't picture how to "mount" everything where the dial indicator is at 90 degrees to the gear tooth. It seems that you are measuring through the access hole and the dial indicator/extension rod would not be square to the gear.