There are some Black Anguses left in California (though perhaps only 1/3 or fewer of their peak-number of location). I loved the place back in the day, especially their Texas-toast-style garlic-parmesan bread that they called “Ranch Bread.” They replaced that at some point with a brown 9-grain loaf that was pretty tasty too.
Out of nostalgia, I ate at one of the remaining Black Anguses a couple years ago... and frankly I was disappointed. The brown bread was the same, and the sides were okay, but the prime rib was sub-par. I don’t whether my disappointment was due to lower beef quality or higher expectations than I had as a kid, but I suspect it was probably both those things.
In the early 1990s I would frequent one in the mission hills area of San Diego. In the mid 1990s I would visit one in Albuquerque. I left the southwest in 1995 so haven’t been in a while.