The stator should not be mounted to the stops one way or the other. 2K-3s have an insert to locate them correctly, 2K-2s do not. Which do you have?
My other guess is the HV coil wire. This has happened to me twice on two GGs. The bond to the coil breaks down and lets in moisture. Conductor corrodes. HV leaks around insulatiion. When checked you will see a spark, but under compression in the engine the spark may not occur due to the extra resistance in the wire. This problem can occur in an instant.
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