1972 Plymouth Valiant 4 door Auto Slant 6

ESMSpartanGarage said
I could swear on my old manifold that was OPEN. I have that fitting and the other stuff that was in that hole was rotted out.

I thought the carb was a potential issue. The old one has a core charge but I have NOT sent yet.
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Some of the early 70s model choke stoves WERE open to the exhaust. @slantsixdan was just confirming this recently. Just use an appropriate choke stove for that recess and your choke will work fine.