I was in grade 12 at the time but knew most of the named faces. You detectives can name the rest.
L-R: standing : extreme left, Robert "Hausker" Eaid, only his face is visible; Roger Lloyd; Don Dobie; Bob McGuire,looking downward; Wayne Baker,hand to chin; Peter Post up high wearing glasses; Ted Dillon, bare arms crossed; Jay Trafford,white belt; over a few unseen faces to: John Gudinzkas,vertical striped shirt topped by menacing sideburns,visible hand; and Michael Blythe at top right.
L-R: seated,visible faces: Dave Stelpstra,glasses,light shirt looking down; Mike Baskerville,with one of the few visible foreheads at the time; David Lindsay,leg up;
Rick Cleaver,long hair, face turned away to left; and John Knott looking at you, bottom right.