Hey, peterpjb, you're repeating yourself.
I hope you're not pinning all your hopes and dreams on the author from this Internet article. If you click on Andy Reid's link at the bottom, there's this article:
https://news.classiccars.com/author/andy-reid/
And he writes:
"The CSX 4000-series cars were built by Shelby on 427 Cobra frames reputedly left over from the original 1960s production run. Whether or not this car sits on an actual leftover frame, it definitely represents an amazing value when compared with period-built Cobras, which nowadays change hands north of a million dollars."
This was posted on 12/21/2016. Did the guy do even a little research? Oy vey. I think Andy Reid should stick to coaching the Kansas City Chiefs.
In CA, Shelby, Kirkham, Backdraft, ERA, Superformance, etc. are all legally called kit cars (no engine and trans, right?) or specially constructed vehicles and are only legal on our roads here with an exemption.