I,like bowties4me used the POR paint, I haven't driven it in anger yet so I don't know how it'll hold up,but I'm pleased with the results.
I run the engine for a few minutes every few days just to keep everything lubed up and have had no problems yet.
I had the headers blasted before I painted them and it provided a really good key for the paint.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.