Shane Whitefield and Marcus Burk scored 14 apiece for the Camels (6-6) and Damontez Oliver had 10. Clemons now has 1,669 points to move past Mike Reidy (1960-64) for fifth on Campbell's all-time scoring list.
Campbell went 5 of 10 behind the arc and shot 64.5 percent overall (20 of 31) to lead 49-29 at the half. The Camels finished the game with 11 3s and shot 52 percent to 34 percent for Allen (21 of 61).
The Yellow Jackets had 20 turnovers that were turned into 27 points.
Rocket Watts, the No. 27 overall prospect in the 2019 class, has committed to Michigan State.
UNC Wilmington will open its preseason basketball practices at North Carolina due to lingering effects of Hurricane Florence.
Guard Miles Wilson has been dismissed from the Miami Hurricanes' men's basketball program for failing to meet team expectations.