said they were ford racing headers
They're definitley 5.0 headers, but I'm not so sure they're FordRacing. I have FordRacing ceramic coated shorties and although the pipe runs are similar to yours, the quality of mine looks a LOT better. Where the tubes join the collector looks "cheap" and not like mine.
Measure the tube diameter and the flange diameter and take a look at Summit Racings on-line catalog for some clues as to who the manufacturer my be.