Lots of ways you can go. If you're looking for originality, then let the paint burn off and
leave it bare and let it rust up, that's what it would have looked like in your garage a few
weeks after you bought the truck new.
If you don't want that look then you can treat it with Calyx exhaust manifold dressing, rub it on and
touch it up every couple of months, looks like cast iron:
http://www.eastwood.com/calyx-manifold-coating.html If you don't really care but simply don't like the look of a rusty exhaust manifold then there are dozens
of hi-temp paints that all the automotive suppliers sell in red, black blue and gray.
So you see, you have to make up your mind as to what your end goal is and what you‘ll be happy with
when you open the hood.
Denny Graham
Sandwich, IL