Find some of the car clubs in Virginia Beach, VA. Ask lots of questions, Mustang club would be great. You can also check with parts stores in the area 1973 Mustangs are pretty rare someone will remember it. Also check with local vintage car dealers, here is one lmnmotorsports.com, ask if they know any other people. Collector car people are generally great. You might also try this trick... I call the local police, they can’t tell you much, but tell them you want to buy a car and just want to check the VIN to see if it is stolen. You never know what you might get. 1977 was a long time ago... it might be gone. In that case find someone with a 71-3 Mustang in your area, they might be up to a ride for you and your brother. I will let you take my Mustang out if you get to MN.