Little trick, contact the lien holder and offer a settlement.. a LOW settlement.
Explain the situation, that you have purchased the truck in good faith, that you have possession of the truck and a second lein [which you legally do, I believe] and you "just want to clean things up"... further the truck is scrap, doesn't run, etc etc.... worth scrap steel prices, not "what your lein is"...
If you play it out right, often times they will agree to release the lien to you rather than fight in court for a junk truck... Worth a shot.
I still want those nice dually rear fenders... btw..