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At 56K original miles the cylinders are probably fine. I would either leave it stock (pretty easy to clean fuel varnish out of the CIS components) or go with higher-compression pistons, cams, and carbs. That will get you to 200hp. The only reason to ditch CIS is for hotter cams. And you need pistons for those. So the question you have to resolve first is whether you're buying pistons.
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