UPDATE:
Incredibly, the current owner of 2078 sent me an email this week with a number of pics of its current condition. It looks like he has done a remarkable restomod and kept the OE 289 & C4 intact replacing them with a supercharged 331 and and AOD. I just replied to him to thank him for reaching out to me with pictures of my beloved 2078. I dont know how he got my email or that I was trying to locate 2078 as I was informed I should not contact the owner.
On that same vein, I am grateful for all the understanding and assistance the members on this site gave me without reservation in my search. Mustangers are truly the best car people !! For decades I had wondered what ever happened to 2078 and if it was being well maintained and enjoyed or was it languishing in a field or barn, deteriorating. Now I know. Thank you, all.