Actually, Chevy orange paint has a slight reddish brown tint to it. I have an original factory painted bellhousing cover and a set of low mile L89 Aluminum heads with original factory overspray paint. Both pieces match which makes me confident that the color is correct. I had a pint of Omni Urethane paint mixed to match the cover which turned out to be a perfect match.
Heads are shown here:
I will take a few of the cover later.
Paul