Bring the engine up to operating temp. Pull the spark plugs, disconnect the ignition power at the HEI, hold the throttle open, take a compression check of the engine on all eight cylinders.
Check the readings on the paper you wrote them onto to make sure they are all within 10% of each other. If the readings are good, say over 150-160 lbs., this will eliminate the the integrity of the combustion chamber.
If you find two clinders reading the same, you might suspect a blown head gasket between those two cylinders.
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.