Has a FIBA World Cup game ever ended 98-65?
Exactly once. On May 16, 1970, Cuba beat Canada 98-65, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 98-65 in league history.
That makes 98-65 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 99-65 has happened never and 98-66 has happened never.