I don't recall the Ramchargers ever having an outlet for their stuff, much less a national chain of them. The Ramchargers were a group of Chrysler engineers that loved high performance, and built awesome drag cars. They did build engines for others, but I was not aware of any kind of "special outlets" for them; they built for others when asked to, and did what their customers wanted. This would be very similar to the way that custom engine builds are handled today. Proving that an engine was built by the Ramchargers would be another problem entirely. Documentation is the only way to prove its provenance. Many engine builders sign their engines in some way; I put my initials on mine. Some kind of identifier that verifies that it was that particular engine which was built by them, along with an invoice or work order from their shop, would be a nice start. A letter of authenticity, signed by the guilty party, would also be helpful. Without some kind of documentation, it's just an engine.