AFAIK the front or leading edge of the egg crate section is unpainted. The rest of it is flat black. This is based on the appearance of my one owner 1969 340-S.
I restored the egg crates by painting them from the rear with flat black and with tape masking off the front edges. Or you can paint first then sandpaper the paint off the front edge if you think the egg crate is stout enough to withstand sanding.
Yes, I did a second set like that, spray flat then sand front with a 2 inch block of wood and 1000 grit paper
