Totally agree on the level of difficulty and not counting on anything but figured it doesn't hurt to start asking around. I do at least have the license plate number of the 68, shown in this other photo. I may have another photo too, I'm still looking.
The pictures in the first post were taken from the top of our street level flat roofed garage, you can see a part of the roof in one photo.
Identifying either car would certainly be a long shot but maybe could be traced backwards from where it is today. I'm assuming that given the accident the '67 is likely long gone for parts or junked at the time by the insurer, but the '68 may well be around somewhere. Interesting to ask around anyway. Thanks for everyone's input.
Thanks,
Mark