Despite the fact that I've been leaning towards fuel, BT's mention of the ignition module reminded me that I had a similar symptom/problem once with a 5 liter Mustang (302 cid) so it was plausible. New module was a quick fix.
I don't know much about this, but I recall stories of fuel system problems from one end of the boat to the other when Ethanol was introduced. Sounds like you've replaced almost everything but that rubber fuel line. Is this a possibility?
Despite OP's frustrations, this has been an interesting thread. Thanks for letting us all participate and for giving good feedback.
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