Well this sure is a poop deal. Fwiw generally changing a factory balanced flywheel with a neutral one won't produce a noticeable vibration. It may be more pronounced with a manual trans though. To further complicate things we've seen aftermarket billet flywheels with a removable weight that has the wrong weight added. Someone figured out they could use an Oldsmobile weight rather than a Pontiac to make things more profitable.
One way of attacking this issue would be to purchase a flywheel with the correct removable weight. Have a shop neutral balance the flywheel with the clutch attached and removable weight removed. Now install the balanced assembly without the weight. If all seems good enjoy. If it still has a vibration install the "removable weight" and hopefully that fixes the vibration. The weight might be able to be installed with only the removal of the inspection cover.
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