Has a FIBA World Cup game ever ended 103-70?
Exactly once. On July 1, 2018, Poland beat Kosovo 103-70, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 103-70 in league history.
That makes 103-70 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 104-70 has happened never and 103-71 has happened never.