Has a FIBA World Cup game ever ended 77-63?
Exactly once. On May 21, 1963, Brazil beat France 77-63, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 77-63 in league history.
That makes 77-63 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 78-63 has happened never and 77-64 has happened 1 times.