This seems to be best summary of what happened:
http://www.crimelibrary.com/terrorists_spies/assassins/ray/1.htmlIf you believe that the FBI was honest, then Ray was the assassin and obviously had help. He left the rifle near the site of the crime, and it had his prints on it.
If you assume that Edgar Hoover was out to get King, then the evidence against Ray was fake, and perhaps Ray was a patsy. The King family does not believe that Ray was responsible, but then, they are not forensic experts, either.
He did use the name Eric Starvo Galt, and this was the name of an actual real Canadian, that Ray once said he found in a phone book. His passport, however, was in the name of George Ramon Sneyd.
The Mustang was not new, but it was a 1966 and was not more than two years old, either.
I recall that some DJ on KOMA, a powerful radio station in Oklahoma City, mentioned that there were many, many white Mustangs, and broadcast an invitation of everyone that had one to drive to his studio. It caused a monumental traffic jam, drove the OKC cops nuts, and got the DJ fired. People came from as far away as Montana and North Dakota.
