[750hp]

They weren't, although I've seen a number of body/chassis units over the last couple of years that were built by Arntz back in the early 80s and still haven't been finished. I'd expect that the Cali ID tag simply outlines the first (or most recent) time that the car was registered in that state. I've seen and heard of Cobras that have a handful of different ID tags fitted as the cars make their way through various owners and various states over the years.