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I checked out your tower of power on the link you provided. What a work of art you have there. First Class, and kudos to you. Lets say the gentleman wanted to purchase such an engine. What are we talking about on cost and warranty? And where do you get an engine like that? I agree that a classic deserves a classic. I have a 1972 13' smirk/blue interior with a 1972 20HP tiller Mercury and love the package. It took quite sometime finding an old outboard mechanic that knew how work on it to dial it in. It took some time and patience to gather the correct parts. If someone would purchase an engine like yours, he better at least know if there is a master mechanic who knows how to work on it. I guess it all boils down to what you're into. Maybe the difference is like owning a classic car, or a new car. One more thing, if you ever want to compare fuel consumption, the 4 stroke will out perform the gas guzzler tower hands down, any day of the week, I can hear the carbs sucking gas from here.