I've never heard anything bad about the Volo Auto Museum, actually, they are the ones that did the appraisal on my baby when I got her back from the paint shop last spring. The guy who did my appraisal seemed quite knowledgeable about Vettes, so I'd have a good feeling if I thought about buying one from them.
I must say I'm far from being an expert when it comes to "numbers matching" and engine inspections. I would, however, be willing to check it out and tell you what condition the paint / interior, etc... is in.
Let me know if you're interested (email or PM me with the specifics on the car if you don't want to post them here).
Barb