In my presence, Jack Colavita ran about 245 against a rock solid shortstop named George Pharo at the Golden Q in Queens. I recall Jack indicating it was his all-time high. My best guess is that the run occurred in either 1985 or 1986. Perhaps he ran more than that at a later date, but, if so, I never heard about it.
I've heard a few suggest that Babe Cranfield may have had more 300 ball runs than any other player in history. He is reputed to have run over 700 in practice..........twice.
New York City's best straight pooler of the last thirty years may well have been Pete Margo of Staten Island, but I have no idea what his high run is.