Maybe I`m blowing smoke here, should he use a piston stop, confirm TDC, mark balancer and rotate engine by hand to line up mark where he needs it, reinstall plug, loosen dizzy, use a timming light, turn key on without starting engine, rotate dizzy by hand until light fires then lock down dizzy, he should be right on the mark regardless of what the balancer says if it has slipped. I`ve set up a lot of rebuilds this way to insure its right upon fire up.