As the subject line would suggest, Dave Freiburger from HRM/Roadkill (and a few others) is looking for a long lost 68 Dart-vehicle and contact info on the screenshot
Have you called up your county tax assessor's office, state DOT/DMV?
I believe those would be the steps I'd take in Texas to research past ownership...your state is likely different...and the research may incur a fee.
Good luck