Well I've never been a big fan of Chrysler motors, but replacing that with a Merc that is 10 years older to me doesn't make any better sense either.
IF there is a way to convert that Chrysler over to a solid state ignition I'd look at doing that.
In both cases, I can't imagine parts are easy to come by just due to the age of both motors. Also keep in mind the effects of ethanol in the gas - those engines were not designed to run them so unless you can rebuild them at some point with gaskets and other components that are able to handle that stuff either way seems like it's throwing money away. I'd look to spend the least amount as possible to fix what you got (a known quantity even if it has problems) and start thinking about a future re-power with a newer offering. Deals can be had on older 80s and 90s vintage 2 strokes as many people are replacing them for newer 4 strokes.
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