Goaztecs,
Most of the badges on the site you posted were no doubt created for people who worry about "truth in advertising" on the side of their car. But, with the exception of the "427" and "Powered by Ford" badges are not accurate. That's not to say somewhere along the line, someone didn't slap a different badge on an original Cobra.
I personally don't think it matters what you run, if you like it, but if you're concerend about it, why don't you just run the "Powered by Ford" badge, which was correct for the 289. Accurate one available on the site below
http://www.cobraaccessories.com/cata...75813e388098d0