Manifold EGR Jets

My brother had a 77 van/360 with missing floorjets; but the EGR was blocked off.
I took the intake off to go find those jets, but the were not anywhere in the engine so I assumed someone had taken them out. Seemed to run fine, lol. But yeah, those hole were pretty big......
They did not look like pipe-thread to me. More like the bung-plugs that you see in oil-drums.
But that is an oooold memory.