Has a FIBA World Cup game ever ended 87-83?
Exactly once. On November 26, 2017, Jordan beat Lebanon 87-83, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 87-83 in league history.
That makes 87-83 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 88-83 has happened 2 times and 87-84 has happened 2 times.