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Do these carbs have chokes? If so, I have another idea to find a lean carb at high speed, but it will require an assistant. Disconnect the choke linkages from each other so each choke valve can be closed independently. Have the assistant drive the boat while you manipulate the chokes paritally closed one at a time…. When you choke a normally functioning cylinder, you should lose RPM. RPM will pick up on a cylinder that is lean. If you get no change in RPM, that cylinder is dead for some reason…Perhaps no fuel is getting to that carb bowl…..Perhaps the cylinder has no spark, or some internal problem.
Hopefully this engine is on a boat where you can get near it while running at higher RPMs….