When I lived in New York I knew a guy who had one of them Elvis Cadilacs. It was a 1959 convertable. The only thing different from when Elvis owned it was on the dash board, where it once had "Elvis" spelled out in diamonds, the previous owner had the diamonds replaced with diamels or rhinestones or something. It only had around 20K miles on it. He kept it in a garage with a thick coat of paste wax on it. Once a year he would buff it out to a nice shine and drive it in one of the local parades.
He also had a fully restored 1958 Cadilac herst. (sp. hurst?).