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Vacuum Port

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No. BN1/2s have a separate manifold for each carburettor. There is a 'balance pipe' connecting them; it would be possible to fit a barbed or threaded fitting.
 
So if I wanted to be able to fine tune the timing using a vacuum gauge I would need to tap a port where my finger points in the attached file ?
IMG_9436.jpeg
 

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Yep. One well-respected Brit car mechanic was offering a PCV kit for BN1/2s, and he did just that (though the tap is on the bottom).
 

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