It depends on the car. If it was a T/A or AAR, black is correct.
On other cars, it seems to be a "hit or miss" type thing. Some cars had it blacked out and some did not. So.......
If you found body color there as the original color, restore it that way.
If you found black there as the original color, then restore it that way.
If you are not interested in restoring the car, then just do what you like.
Barry