Static compression numbers look good. I ask about a running compression test because I've seen lifters collapse when running a few times and you'll have 7 good cylinders and then one real weak one.
Did this start before the carb swap or after?
Do you have the flex plate that you saw the engine run with? Or just any flex plate for that matter? I'm wondering if the flywheel being a lot heavier then the flex plate is making the vibration worse and its actually been there the whole time, you just couldn't notice when on the stand.
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