1972 California 318 EGR

Hi All. It's come to my attention that my 1972 Swinger w/318 probably had some add-on emissions devices because it was sold in California. The first was the NOX system, which was long since disabled and I've now completely removed.

But the second was an always-open EGR. There is no vacuum valve on my intake manifold and I want to take a look and see if there are indeed open jets down there. The FSM for the year mentions that California cars had this, but it doesn't show any pictures or diagrams. Can someone describe what I'd be looking for? Do I have to remove the carb or can I just see them through the carb? If they are down there, is there a way to plug them?