Appraisal

So I recently acquired a 1968 Firebird from a member of my family.  It hasn't been registered in over 20 years and never to anyone in my family, so I can't register the sale as a gift.  The problem I am having is the outrageous value the DMV is putting on the car.  Currently NADA appraises the car around $12,000 but I feel the car is worth less.  The body is garbage, with huge dents and a few rust holes, and the worst paint job Ive ever seen, with over spray all over, that is already faded and trashed At $12,000 the tax would be around $600.  The car barely runs and the interior is shredded.  Is there a way I can get a lower value appraised to not get way over charged with taxes?