Crankcase ventilation.
You make this so difficult and yet you have printed descriptions of everything on that carburetor in that picture up there ^^^^. REMOVE that metal ring around the carburetor. LOOK on the front of the choke horn and READ and then POST HERE what the number is after the word LIST. That will tell us what carburetor it is. The power brake booster should be routed to a fitting on the intake manifold by itself. The PCV should be routed to the port on the carburetor. The distributor needs to be attached to the timed spark vacuum port. If you will simply read the picture and do it, all will be well.