being very clean w/nice paint and a new interior will always get you someone to pay more than its worth. last year i sold an 84 sl 500 euro with 176k on it 4 16k.
i had just put a beautiful 3- stage paint job on it and re-apolstered the interior. it was recently tuned up with new brakes but i dont think it was worth 16k i only payed 3500 4 it.