Just an FYI ... I'd soda blast the air filter housings instead of glass bead. Glass beads have a tendency to get lodged in nooks and crannies and it's difficult to get them all out. They'll eventually dislodge with the vibration of the motor down the road and get introduced into the motor.
Glass beads are OK for blasting external parts that don't handle intake air, fuel or oil. If they do, they will destroy the internals of your motor