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A manifold leak would cause you to run lean because of to much air. The plugs are a good indication. Haven't heard of a intermittent leak at RPM but anything is possible. I have no good procedure for checking the engine while hot.
I'm not familiar with the 81's electrics/ignition but I would check the ignition's advance mechanism to see if evrything looks okay. Ignition advance is a rpm related function. Ihave a old points system with mechanical advance. Maybe someone else out can help you with this.
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