A Mk3 3.0S is a fantastic car, especially with the specifications of yours, and it's great that you're restoring it to it's former glory.
I came across this photo on Flickr and the uploader states in the description that it is "owned at present". As the photo was uploaded in 2006, it could be a previous owner that you are not aware of, so it might be a line of enquiry worth pursuing.Ford Capri Genunie X - Pack
, on Flickr
chrisanythingv6 wrote: Also performance ford mag has an old feature saying that the car was built by the chaps at Aveley AVO
Maybe it was, maybe it wasn't, but AVO closed in January '75 and JCK909S was registered in May '78....
Good luck with your search,