Vacuem advance question.

Hi all, hope someone can help me out with a "basic" issue.
I have a 73 Dart, 318 2bbl which never had the vacuem advance connected to the distributor so, where do I connect the vacuem line to?
There is a port on the side of the carburator about mid way up on the passanger side, do I connect there, to one of the ports at the base of the carb or directly to the port on the manifold.
Thanks in advance for any help.