Has a FIBA World Cup game ever ended 78-74?
It has. 78-74 has been a FIBA World Cup final 6 times in 2,041 games. The first was Canada beat Japan on May 23, 1963; the latest was France beat Germany on September 1, 2019.
That makes 78-74 the 8th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 79-74 has happened 6 times and 78-75 has happened 5 times. At one point the score disappeared for 43 years, between 1967 and 2010.