Has a FIBA World Cup game ever ended 91-67?
Exactly once. On September 2, 2002, Canada beat Lebanon 91-67, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 91-67 in league history.
That makes 91-67 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 92-67 has happened 1 times and 91-68 has happened never.