I talked with an individual that has photos of the car after several years in the barn. It does not look good..... It has not been taken care of since he purchased it as witnessed by him letting it sit in a horse barn for numerous years.
Believe or not its not unusual with rare vehicles. In New Zealand (my country of birth) there was an old hermit in the Nelson area, living on his late parents farm, with no phone or letter box, who had a large collection of very historical WW2 aircraft. All original, unrestored and languishing in a home made shed. He had no money or will to restore them, and would usually chase off any visitors. I was lucky enough to befriend him whilst at flying school a few miles down the road from him. He was an enthusiast of these things in the late 1950's and early 1960's when nobody cared for such things, and they were being cut up for scrap. He used his Dad's farm truck and hay trailer to drive to several RNZAF bases and wreckers yards and collected, wait for it;
2 x Curtis P40's (1 with WW2 media history and zero kill markings on it)
1 x P51D Mustang (engine still turns and drips oil)
1 x Harvard / Texan
1 x Hudson bomber
1 x Tiger Month RNZAF WW2 trainer (immaculate back then, he did his PPL in it then put in into storage!)
1 x DH Mosquito (80 hours on it, completely original) - Yes I kid you not, one of the rarest WW2 fighters ever and almost unmolested. The engines ran until he ran out of money to buy the 200L drums of avgas necessary to warm them up!!
Plus many parts; RR jet engines, DH Vampire & Canberra fuselages, Wheels etc)
He was like the Bullitt owner, bought it cheap and just likes having it in his shed. No interest in sharing it or using it, with the exception of letting the odd warbird restorer measure or photograph things in an "as it was" state. Sadly some took advantage of him and didn't return borrowed parts etc, perhaps leading to his lack of an open welcome to all.
He would let me sit in the Mossie's cockpit and help him pull the P40's out so he could sweep the floor, and that made me "special" in the eyes of the locals. But like the Bullitt's owner, he just let them slowly fade away... rather sad, but then to be fair, its "his trainset" and we should be grateful he had the sense to save these things when the rest of society couldn't care less...
Perhaps one day, when the Bullitt's owner dies, or hopefully sooner, the world will once again share this special car. Often its simply money that takes over. When that special person passes on, often the kids or spouse simply see big $$$ signs and flog it off.
If his son drives it, then great, although I hope he doesn't butcher it getting it roadworthy... Altering anything unnecessarily on that car would be criminal IMHO!