Sounds like severe flooding, as in trash in the needle valve, sunk float, or bad needle/seat.
If it flooded bad enough to put liquid gas in the cylinders, there will be gas in the oil. Check the oil level, most likely it will be over full, if so, change it before going any further.
The cylinders will be washed down, give each a squirt of oil, spin it out before replacing the plugs.
The carb will need to be opened up and the problem found. Could just need cleaning, or a new float if it has fuel in one of the pontoons (give it the shake test, listen and feel for gas inside), or the needle valve replaced.
The carb is simple, easy to repair, better than the new aftermarkets if original. Lots of how to videos on Youtube.
Take a gas sample in a clean glass, see what's coming down the line. If the tank is contaminated with rust, diet, water, it will need to be cleaned, or replaced/repaired id severely rusted. Be sure the screen is in the sediment bowl. Purge the line before reconnecting to the carb, it only takes a tiny speck of trash to make it flood.
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