Has an NBA game ever ended 83-74?
It has. 83-74 has been a NBA final 22 times in 73,172 games. The first was St. Louis Bombers beat Cleveland Rebels on November 16, 1946; the latest was Atlanta Hawks beat Boston Celtics on April 29, 2012.
That makes 83-74 the 917th most common final score out of 3,189 that have ever occurred in NBA. One point away, 84-74 has happened 17 times and 83-75 has happened 16 times. At one point the score disappeared for 46 years, between 1949 and 1995.