To Freddie's point, I don't know of an engine builder who does a complete build, (including timing cover and balancer) that would not confirm TDC. With the variations in timing covers and balancers, there is no way properly know where the timing is at.
On a different note, did you hear this thing detonating?
Sorry to hear you are struggling like this. After everything you have shared, I believe the time has come for you to find a different engine builder.
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