Agreed with everything posted above. The drones at the emissions police wouldn't know an EGR if the tripped over it, plus it isn't needed to pass. But they know what a smog pump looks like. as long as it is hooked up and appears functional you'll pass the visual. 1977 was the last year pre-cat so you don't need to worry about that either.
Main thing is to pass the sniffer, and they keep moving the goalpost from what was originally required to tighter and tighter. Keep those old "clunkers" off the public roads and all that.