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Good morning, Jason here again.
It sounds like the carb have some debris in them, and the idle circuits are clogging. Did the engine otherwise make full power when out on the water, and the boat at top speed?
Is there any kind of fuel/water seperating filter between the fuel tank and engine? These look like oil filters.
Got it. That is going to further point to the carbs having trash in them. The issue is the idle fuel circuits inside of the car are going to be clogged up. That would require them to come off and be rebuilt. It is also a very good idea to add a fuel/water filter to the boat. If there is debris in the tank and no filter is added anything in the tank will end up right back in the carbs. Does that make sense?