Howdy Frank:
I'm not aware of any movement or interest in creating and casting an iron header for the USA head. This is a very small market/demand and there are three options for headers now with the recent inclusion of FordSixParts.
If you're talking for your '60 wagon, you can upgrade to a '63 or later OEM cast manifold which offers some improvement over a '60 manifold. 2" outlet vs 1.75, Donut type gasket vs flat. The later manifold along with a 2" exhaust system would be a significant help.
Sorry, probably not what you wanted to hear.
Adios, David