Has a FIBA World Cup game ever ended 83-67?
Exactly once. On May 29, 1967, Brazil beat Poland 83-67, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 83-67 in league history.
That makes 83-67 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 84-67 has happened 2 times and 83-68 has happened 1 times.