It's DupliColor "Cast Iron" engine paint. The sheet metal is black wrinkle powder coat. I've used the color combo before, and it seems to make a nice understated scheme that also works with aluminum.
I actually posted the pictures to see if anyone was interested in the home-made serpentine belt drive system. I couldn't find any sheaves with GM centers of the right diameters, and so transplanted GM centers into Ford sheaves. Quite a trick without a lathe. Brackets are all home blacksmithed.
