A co-worker turned me on to Park Chop Suey back in the early 80s. Back then, Steven Yuen was behind the window barking out orders and he was a character !
There is a younger woman running the place now and they have moved from that old converted house on Park to a remodeled gas station at the corner of 14th and Chippewa.
Their sweet & sour pork/chicken are great as are their crab rangoon and wontons. The biggest problem is the high tax rate in St. Louis. The last time I was there, it was just under 12% and that was over a year ago (for obvious reasons).