Welcome to MightyRam50! Ported vac to the ignition advance should be fine, but to set the static base timing, pinch the hose with a clamp or just temporarily disconnect it and cap/plug the open barb or hose to the carb (depending which end you disconnected).

There should be a decal under the hood with the factory advance spec, which IIRC should be ~7.5°. If you don't have emissions testing, you might get better performance/mileage with slightly more advance, up to 10° or so. The usual method there is to bring the engine up to operating temp and raise the idle to ~2000 RPM (with vac advance disconnected), then slowly rotate the distributor until you find the spot where RPM rises to a peak on its own.

BTW, vac advance can actually be fed by manifold vacuum rather than ported off the carb. That's how all vac advance used to be connected, but they switched to ported vac to reduce emissions at idle. Switching to manifold vac should improve fuel economy and reduce operating temperature at idle.