Sounds like the float valve may be stuck? Could be AAP? Could be vacuum leak?
Sounds like more of fuel/air thing than ignition.
Can you look straight down the carb before you try to start the engine, turn the throttle linkage and see if you can any fuel shooting into the venturi?
Rebuilding that carb is not too bad. I've rebuilt lots of carbs in past years, but haven't opened one up in years. The rebuild kits come with detailed instructions and diagrams.
Gnarls.
