John, The line come up on the other side (outside) of the dash rail and then the 90 across the top outside of the windshield opening and another 90 to turn and go back thru the header to the inside. There are two clips to hold the line that are attached with the windshield hinge to header screws. The right garnish and the windshield frame hide the line when they are installed.
john
hold your windshield side molding in place, you will notice that there is a little step on the edge of the molding, your vacuum line runs down right under that step. there is room to let the line go down through the corner to the firewall.