20 years wondering no more

Hey I wanted to wish you all the best of luck, I have a few ideas. Do you still know the vin#? I'm not sure what Oregon's DMV computer software is like but in California you can do a title search by the vin. If it's not registered currently it's kind of a bust except it will tell you the last registered contact info and they might know something about who they sold it to.
Next try the local parts places around that area. The counter people remember cool cars, maybe they know the owner.
If you find your car the current owner might still be having the same issues and might want to sell it.
Lastly since your in OR. Google Mark worman and graveyard cars. Call his shop he has been putting together a contact list of clients and mopar owners around the west coast. He might be able to help plus that's the exact story they want for their show. Man falls in love with car, has to loose his love, but has never stopped searching, and now has found his first love and now ........
That's good TV .