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Do you have spark on the bottom two cylinders when you get above 2500 RPM? You can use a timing light on the plug wires, and just watch the flash to see if there is spark.
Your engine is what is called a 2+2. It will idle and run on 1 and 2 up until about 2500 RPM, then 3 and 4 come is and help make the power. Has your engine been sitting for some time?
Have you checked to make sure that there is no water in the fuel?
Also, what is the compression on the engine?
With the boat sitting, the fuel in the carbs evaporates, leaving behind the oil and a varnish. This would clog the jet and the tube in the carb bowl. Pull the rain screw from 3 and 4 carb. If it is gummy or green looking, you will need to clean the carbs. They come off as a unit, so might as well as look at all 4.