Has a FIBA World Cup game ever ended 83-70?
It has. 83-70 has been a FIBA World Cup final 4 times in 2,041 games. The first was United States beat Cuba on July 9, 1974; the latest was Serbia beat Iran on September 1, 2014.
That makes 83-70 the 44th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 84-70 has happened 1 times and 83-71 has happened 1 times.