Ahh, well, the rubber hose will more than likely be from the 'ol vacuum wipers. There is a fitting on the intake manifold, where the rubber hose would connect. You can plug this with a 1/8" pipe plug, brass is nice, as it comes out easy if you ever want to instal a vacuum gauge, or connect some other vacuum accessories, such as an ash tray, or fan, or Southwind Heater, etc.
There will be (should be) a small steel vacuum line that runs from the carb, to the vacuum advance on the dizzy.
