I have heard rumors of Fenton headers with "Ford part numbers" before. I would believe they are a hoax.
Does anyone else remember the supercharged 1948 1/2 ton with a lot of accessories that some dude was trying to pass off as an "Experimental Ford prototype" about 5 years ago? It turned out to be totally bogus, but some people sure were excited it about it for a while.
Probably in the same category.