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The float level won't really affect the starting. Next time just set it so the float is parallel with the body of the carb held upside down.
What do the spark plugs look like?
Have you done a compression test? What kind of pressure?
When you pull the choke and look into the throat of the carb is the choke plate partially open, open or fully closed?
The throttle cam on top of the carb is it worn with a groove in it?
What spark plugs are you using?
Please answer all these questions and we can narrow down the problem area.
Compression will vary with the gauge. Looking for either real low or difference over 15#.
When you choke it are you holding the choke all the way closed? When you open it do you get a little gas out the carb?