‘67 Barracuda vacuum gauge connection

The engine I need to hook up is a 318, 2 bbl. The manifold has a vacuum connection for the power brake booster that has two smaller, capped ports.
That's it. Use one of them. For routing. Of course there isn't an original to copy for a '67 318 2bbl, but it should go back to the firewall and then through a grommet.

My car was originally a 225, but my guess is the grommet location was the same for v-8 with the vac gage.
That's the original hose. It's a smaller OD than the typical vac hose from the parts stores.
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