Excellent Job! I am sure many will use this informative video.
Would it not be better to remove the spark plugs at the start to make your first 15 seconds of dry cranking a little easier on the starter?
Is it a good idea to loosen the fuel pipe just at the carb and bend it out of the way (straining the fuel pipe).
What was the reason for the first 15 seconds of dry crank, does the engine have hydraulic lifters?