What electronic system do you have? If its vacuum driven, you would connect it to this port. If not vacuum driven, you should close this port. Post a pic of your distributor.
I have a stock distributor converted to electronics with a Pertronics, it uses vacuum.
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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic