The win sets up a showdown with Douglass in today's championship game.
Tip time will be 7:30 p.m., and the game will be played at Douglass High in Atlanta.
Callaway is the number one seed, and Douglass is seeded second.
In two regular-season games, each team won once.
"It's going to be a slugfest," Callaway head coach Terry Hayes said.
Against Chapel Hill, the Cavaliers ran out to an 11-0 lead, and they maintained the lead throughout the game.
Callaway was up 17-9 after the first quarter, 36-25 at the half and 55-42 through three periods.
Nehemiah Jones led the Cavaliers with 22 points, and Terry Godwin scored 12 points.