1967 273 Intake Question

I bought a 2536771 and it does not have the large port.
20180619_103215.jpg 20180619_103316.jpg
There do not seem to be any ports from the cast iron boss to the intake runners or anywhere else.


This is the smaller port that I assume on the 4bbl is for the CAP manifold vacuum like on the 2bbl
4bbl on left 2bbl on right
20180619_103338.jpg 20180619_100938.jpg

20180619_100951.jpg

20180619_100959.jpg

20180619_101009.jpg

20180619_103222.jpg

20180619_100917.jpg