As I ready my Auburn head to reinstall after I've had it milled flat, I find 2 hole on the manifold side of the distributor mount (tower). The top one is threaded and the lower one is not. I would guess the lower one is a breather hole to maybe allow oil to rise up the distrubutor shaft for lubrication? Does anyone know the real purpose for these holes? The car does not have the Electrolock option. Thanks, Thom