1982 650 csr

On my 82 650 csr where does the petcock vacum line go on the carb? Also there was two lines running up off the carb look like vent lines what holes do they go to on the carb? Theres 4 holes the 3rd cylinders has a cap on it.

The carb vent lines are off T fittings between #1 & #2 and between #3 & #4

Vacuum comes off a nipple located on the top front of carb #2. There also should be vacuum nipples off the other carbs but those are capped. To do a vacuum sync you are to remove the caps and connect the gauge to each carb.