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You should make a great big deal about this to the seller, but I frankly wouldn't worry about this a bit.
Maybe there is a little warping or a weak gasket between #2 and #3. Or a rough valve in #3. But 90 pounds is enough to keep running indefinitely, there may be nothing wrong at all. Put some Marvel in the gas as recommended, measure again after a few dozen hours of running, and see what happens. If the rest of the engine is in pretty good shape, taking the head off, milling it, and replacing the gasket should take you a day and cost $100. And that's only IF it gets worse.
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