Has a FIBA World Cup game ever ended 66-41?
Exactly once. On October 31, 1950, Argentina beat France 66-41, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 66-41 in league history.
That makes 66-41 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 67-41 has happened never and 66-42 has happened never.