All series' of the MEFI ECMs have knock sensor feedback, and a 3-dimensional lookup table for the spark advance, so I'm not sure where your info is coming from. All carbureted, electronic ignition based marine engines have a simple spark advance table that is only based on RPM, not engine load, and will happily blow apart the ring lands on the pistons all day long if preignition occurs.
I'm glad you intend to keep the by-gone days of carburetors alive, just please don't try to spout off your opinion that EFI is no better as fact. There are people that read this forum for valid information, and it would be a disservice to them to think their best solution to a minuscule problem is to rip off the EFI and slap on a carburetor instead. Carburetors have only one advantage over EFI; simplicity. Even so, there are so many people out there that purchase remanufactured carburetors instead of spending $30 on a rebuild kit that it's silly.
Reminds me of the people that would pull all the EFI stuff from their Crossfire Injection Corvettes and F-bodies to make way for inferior performance. I guess those that don't want to take the time to learn how an EFI system works should probably go that route, because hey, spending $600 to convert it to a carb is much better than spending an hours' time reading about theory and $19.99 on a coolant temperature sensor that was causing over-rich running conditions.
Jd, greater efficiency means greater horsepower. I think you have the term "efficiency" confused with "fuel economy". But hey, if you too prefer less horsepower, then go for it man!
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