1969 Swinger F6 Green

This might be a long shot for your state, but I just found my 70 swinger that I've been looking for 11 years. I had the VIN tho. What you can do is file with the DMV a record search for you or your fathers name, whoevers name the car was registered to. This will give you all the cars he has registered in his name at one point, giving you a VIN.

After you get the VIN, you will have a better chance of finding it. I was lucky because my car never left the state. You can however find the last registered owner in your state and go from there.

Good luck! I know exactly how frustrating this can be.