Wish my memory was better because I recall that Paul Knippen (Paul K on this forum) has a part that bolts on the end of the Pontiac cylinder head and comes around to supply a place to screw in the manifold bolt where no holes were drilled in the head for a bolt. I believe he sells these parts on eBay. Wish I had the link for you.
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"No replacement for displacement!"
GTOAA--https://www.gtoaa.org/
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