FWIW I ended up going with the the POR-15 manifold gray, after a good sandblasting. The Master Blaster told me it's really important not to handle them post-blast without gloves, the oil on your fingers impacts header paint adhesion / performance he says. But the results have been excellent.
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"A MAN IS ONLY AS OLD AS THE WOMAN HE FEELS."
-- Groucho Marx
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