Stan:
The upper port on your most recent photo is a "timed" port, which would connect to your distributor vacuum advance.
If you look at your first (top) photo, from where you're holding the carb, look to the right across the fuel bowl and then down to the side of the carb mounting flange where the mounting bolt hole is. It looks to me like there is a threaded plug in what would normally be the PVC port. That port normally has a hose nipple install for connection to the PVC valve. But I sure could be wrong …
Russ
