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Hi Jerret, my name is Jason.
What were your compression numbers?
Have you thrown a vacuum gauge on the engine to see if there was any flutter?
Does it pop at idle, or only when you throttle up?
You could unplug the fuel pressure regulator and stick the vacuum gauge on that hose
How old is the gas in the boat, and have you run it on another fuel supply yet? Also, have you checked fuel pressure?
Let me know what you get for compression numbers. After that, hook up a fuel pressure gauge and duplicate the problem, and see what it's running for fuel pressure and let me know about that as well.