Re: 1964 stepside c10 230 inline six
If the exhaust manifold is leaking at the head, I would take it off, take it to a machine shop, and have it fly-cut so the face is flat.
In my opinion, a re-surfaced stock manifold is better quality than a replacement one.
If the manifold is cracked elsewhere, I'd consider having a good cast iron welder fix it.
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