there are some very interesting blocks slightly bigger than a 5.7, about the same weight, 6.2 for example. Check out their fuel economy for your application. Big blocks(454ci) were notorious for bad fuel economy, at least that used to be true, fuel injection might have changed that.
I'm planning to go over to Miami to the boat show and get some more detail on those egines. I'll pass on what I find out.
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