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The metal flap within the exhaust manifold is rusted and does not move…think I could get to it by separating it from carb base..but these bolts don’t budge..tried pb blast and heat…afraid I will break off heads…probably 83 years old…any other suggestions ? Tks..

Heat, and lots of it. Or induction coil.
And yes, its gotta come apart to get the flap released from the shaft, its pinned in the middle.

Tapping lightly with a small hammer on the shaft ends, first one side, then the other, over and over again will often loosen a badly stuck shaft. If you can get all the oil off the parts, soaking the shaft with Blechewhite or CLR as you tap on it may loosen it. Try to get the liquid on the shaft ends and inside the manifold and keep it all wet with the liquid while tapping the shaft endwise. I would avoid separating the manifolds if at all possible.