Has a FIBA World Cup game ever ended 84-70?
Exactly once. On August 16, 2017, Bulgaria beat Belarus 84-70, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 84-70 in league history.
That makes 84-70 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 85-70 has happened 1 times and 84-71 has happened 2 times.