The entire floor was primed - Red oxide I think. Then they painted the firewall and floor black about 20-30% gloss. . Lots of time the black did not cover the trans tunnel good so sometimes the red oxide is seen in there. When they painted the topcoat, the bottom of the rockers were painted. So a lot of top coat color got on the bottom because they did not tape it off and they do this quickly.

So yes the entire floor was black but there was a lot of color seen in the wheel wells and underside because of the over spray. No GM under side floors were actually painted the top coat color. chrysler\dodge actually painted theirs body color back in the day.