Way too much money. Restored to its original beauty is a metaphor for about $50,000 US. After that you would have a car worth $25,000 if you can find someone who wants just about the least desirable of all '58 Buicks. A Special 4 dr will cost as much to restore as a Roadmaster 2 dr hardtop, and won't be worth anything like as much. It's a parts car to me.