Looking for a Tubbed 69 340 4 Speed Dart

Have you tried doing a search on the plate through Pennsylvania DMV?
Just a thought...
I would have loved to have been able to find my old '69 Dart that stupidly sold years ago. It also was fully tubbed with 14.00 x 32 slicks all tucked underneath and with the stock rear wheel well opening height - the wheel openings were stretched 4 inches but stock height.
Good luck with your search.