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Have we been using the same spark plug the whole time? Sorry but I just don’t want to go back and read through the ten pages for that one.
I would pull the plug, clean it, if it is new and ding it, if it is old. Make sure it is not FOULED by putting too much oil in the cylinder. Then I would DRAIN the gas from the carb and try to make it at least pop with starting fluid, or better, a small squirt of gas/oil mix in the carb. If no fire, do like retiredoz says and put a small amount in the cylinder; then see if THAT will fire. If not, recheck your spark. It must jump MINIMUM 3/16", not just across a normal plug gap.
When you put it over slowly, with the spark plug OUT, does it make a noticeable, weasing sound, indicating that you have a little crank case compression? If not, you may have a massive lower crank seal leak, which could explain all the fuel/oil coming out of the leg, if it’s not flooding. When you get back to trying to start with a carb full of gas, pull the plug after cranking and smell it. Is it dry or does it smell like gas?
Long live American manufacturing!