Ever heard of Murphy's Law?
If you do pull the heads you are going to want to make sure they are milled flat and check the valve seats and guides for wear.
Or go with the if it ain't broke don't fix it mindset and deal with it later if it breaks. With over 200,000 miles I would take this route personally. Then when something does go, find a lower mileage engine to swap in.
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"The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter
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