Has a FIBA World Cup game ever ended 84-79?
Exactly once. On July 5, 1986, Israel beat Uruguay 84-79, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 84-79 in league history.
That makes 84-79 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 85-79 has happened 1 times and 84-80 has happened 1 times.