The Dec. 2004 Old Cars Price Guide places a #3 at $13,200 and a #2 at $23,100. Most nicely restored cars (not trailer queens) are #2. If the workmanship is there, depending what needs to be done, it could be close to a #2. If it is just reassembly / detailing, then it ought to be in the $20k range. However, what some folks claim is 90% is sometimes closer to 50%.
Everything I know is based on the book. I really don't have a good grasp of value for these cars. I'm sure there are others who might be able to give you a better idea. With this rough idea in mind, you may want to consider getting it appraised by the estate before proceeding with a sale.
Good luck with it. That would be a neat car.
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Derek Thille
BCA #39416, CBC, MBCC #1984
76 Century Free Spirit Pace Car - "Spirit" / 66 Wildcat Custom Coupe - "Ellie" / 62 Special Convertible / 61 Invicta Convertible / 56 Special 4-door Sedan / 54 Century Estate Wagon / 52 Roadmaster 4-door / 41 Special 41SE Sedan / 29 McLaughlin Buick Model 51
2006 Buick Rainier - "Ruby" / 2005 GMC Sierra K2500 - "Max" (the hauler)
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