Has a FIBA World Cup game ever ended 78-43?
Exactly once. On August 30, 2010, Australia beat Germany 78-43, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 78-43 in league history.
That makes 78-43 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 79-43 has happened never and 78-44 has happened never.