What’s the value of this ??

Just my $.02 here, but unless you have a good name as an amazing carb rebuilder, its tough to get more than "core" value for it, especially if it's been "restored".

Don't take this as me saying you can't restore it, the problem is that proving its been done extremely well and that the carb will perform like a NOS part is near impossible, IMO.

So, that said, I'd go with #1 and ask a price that seems to reflect exactly what you've got.