Here's a resource. IAAA is the auto appraisal association I belong to. Here's a map, by clicking you can find an appraiser in the state that the car is in. I can't vouch for every member, but they are vetted better than most other organizations. Expect to pay $100-$300 depending on what you need. Travel can run more, depending on the circumstances.
http://www.auto-appraisers.com/Map.htm
Good luck,
TOM BRESKE
Vintage Viewpoint Appraisals
Seattle, WA