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The calbrated nipple is visible in your picture---it is the big one with the hose coming off vertically, at the top center. The angled one with the hose and screw is either for the vacuum retard on the distributor or the charcoal canister evaporative emission control system. (It's been a while since I had a B20) I seem to recall having an extra port or two on mine---I found threaded plugs of the correct size or, in one car, installed a manifold vacuum gauge, and connected it to the extra fitting.
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