Take a look at the old thread with some recent posts: To Yanmar or Not, which has some parallels to your case and yours is probably a more compelling case for a repower.
Yes you could rebuild those 4-53s for a quarter of the cost of new JDs and they might live another 20,000 hours (how long did the current engines live?). But they still will be old, smoky, noisy, shaky and fuel inefficient. None of which will be true with new JDs.
But consider the Lugger version of these engines. Some think that Lugger does a better job of marinization than JD.
David
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