Restoration correctness?

Depending on how "correct" you intend to go with the black out, it would be sprayed in an upward fashion from below (like in a pit as the body passes over) and areas that would be in the spray shadow would not have gotten blackout. (IE if the area faces up it would not get blackout on it, or if there was something sticking out anything behind it would not get paint to reach it like a shadow)

Found this
Core support "Blackout"

This is my 67. The lower area directly below the radiator I believe had blackout at one time but it is exposed to the road derbies so I think it has warn away over time.

Note the the side facing up on the same piece does not have blackout it would have been in the spray shadow.

Core support 1.JPG core support 2.JPG core support 3.JPG