The Trojans led by as many as 18 in the second half and shot 52.9 percent for their fourth consecutive win.
Gibson scored 10 of his points in the first half and Dwight Lewis finished with 12 points for USC (9-3).
The Golden Eagles pulled as close as 62-54 with less than two minutes left when Ford dunked a missed 3-pointer. USC shot 60 percent from the field in the first half and led 32-23 at the break.
UConn transfer Marcus Johnson made his season debut for the Trojans and finished with six points and two rebounds.