Has a FIBA World Cup game ever ended 50-43?
Exactly once. On October 27, 1954, Canada beat Israel 50-43, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 50-43 in league history.
That makes 50-43 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 51-43 has happened 1 times and 50-44 has happened never.