3) As I understand, facing the side of the car, the black was sprayed perpendicular to the body side. This would mean the part of the rocker that turns under (faces the ground) did not get directly painted, just overspray. Will point out that Norwood blackout done by Fisher, so fenders were not on the car and posted and known examples show a masked line on lower cowl usually tappering upward toward front of cowl. Not imperative in resto, but exact.
My car as an example of masked front cowl (ignore the rust and flaws).