Has a FIBA World Cup game ever ended 88-55?
Exactly once. On August 31, 2002, Spain beat Angola 88-55, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 88-55 in league history.
That makes 88-55 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 89-55 has happened 1 times and 88-56 has happened never.