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So, there's three vacuum ports as far as I can see. The first is the one which my vacuum choke attaches to. The second is the metering block, the third is the one under the primary fuel bowl. Just so I'm clear, which is which and what gets plugged in on the other side of each? Thanks,

(1) correct (2) metering block one is ported for the dist if you use ported dis vac & most but not all apps do (3) extra manifold vac source for air cleaner hot air door vac servo or any other needed full vac source,& good for checking manifold vac level, cap it with a plastic vacuum plug if you dont need it.

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