The paint would be the entire top of the cowl except the corners by the door hinge area. You should not be able to see it through the fender/ cowl gap. It stopped at the edge where the firewall started. No hard tape line. They held a piece of hard foam against the firewall and just blew it in. vega$ had a good picture of his first orange 69 Z that showed it. He was doing engine work in the picture hopefully he will re post it. Here is what mine looked like. Mine is a 05-a Norwood car.
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018