well, looking at my 228, I have a vacuum fitting on the top of intake, between cylinders 4 and 5. Although this is not hooked up, I believe that is the vacuum port for my windshield wipers. the vacuum under the carb, I would guess goes to your vacuum advance on the distributer.
I may be wrong. Do you have a line hooked up to the vacuum advance on the distributer? Maybe somebody connected the tube to seal up a vacuum leak for those missing accessories.
