Intake manifold gasket installation help

Bob Jasinski said
The MS9935 gasket set just showed up. They are definitely different than what is shown in post #1. Very glad I reached out to the list for input on this intake installation, I didn't have a good feeling about the first set. These fit very nice, and they self locate by resting on the tabs that stick out from the head gaskets. The cork gaskets are identical to the 340/360 set I have. Notice that the U shaped head opening above the exhaust gas port is not covered by the gasket. Evidently it just remains open, doesn't seem to lead to anything, so I guess it doesn't need to be sealed. The top photo is the intake gasket from FS 8553 PT-10, above the MS9935 set just received.

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Would the OP's first gasket in post #1 (FS 8553 PT-10) be for an early 273 with a 2 barrel carb intake?
I have a 1965 273 with 2 barrel intake, which has the exhaust crossovers. The OP 4 brl intake manifold does not appear to have the exhaust crossover, although the heads have them. It looks as if I attempted to use the MS9935 on my 2 brl manifold, there would be a gap between the manifold and the head in the area of the exhaust crossover.

I am guessing that the 2 barrel carb needs the exhaust crossover to help with the thermal choke, while the 4 barrel carbs have electric choke?