Has a FIBA World Cup game ever ended 98-83?
Exactly once. On September 2, 2002, Venezuela beat Algeria 98-83, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 98-83 in league history.
That makes 98-83 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 99-83 has happened 2 times and 98-84 has happened 2 times.