I asked about crank fitment because the flexplate didn't look like a Pontiac. Too many holes, I guess, threw me off.
The 4 holes , I believe, are the factory "offset" balance holes. The three larger holes appear to counter balance the 4 holes, making the flexplate "zero " balanced..
Pretty much the same conclusion you came to at #11 But you have to trust the machine shop that the balance was performed. Drilling the large holes to zero the flexplate would not be unusual.
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