Has a FIBA World Cup game ever ended 87-63?
Exactly once. On February 23, 2018, Lebanon beat Syria 87-63, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 87-63 in league history.
That makes 87-63 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 88-63 has happened 1 times and 87-64 has happened 3 times.