[Classic Mustang] Manifold removal?

Been thinking of removing my exhaust manifolds so I can put on a coat of high temp cast gray and get rid of the ugly "burnt rust under the hood" look (lol).
Should I try to take em off cold, or warm up the engine first?
And if warm, drive it around and get gloves warm, or just a bit of idle warm?
And can the bolts be reused or do I need a new set?
289 V8 on a 64.5 if that matters.
Thanks!

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