Ask the seller to define "Survivor." Does he have a certificate earned from Bloomington Gold? If not, then the car is not a Survivor (they have the term trademarked and have strict requirements for it).
That said, even if it is a true survivor, that doesn't mean it's in pristine condition. I would, at the very least, find the services of a mechanic near where the car is (and not one recommended by the seller) to have it checked out. You might even ask a member here to take a look if one is near.
My opinion, if I were as far from the US (where most of the parts are), I would not want to get a survivor. That way, if you need to repair, replace, or fabricate something, you won't need to worry so much about it not being original. But that's just me. I never intended to get a car as original as mine (it is not an official survivor and I'm not sure it would qualify), but I now find that I spend more on repairs for certain pieces than I would like to and I feel limited in "personalizing" the car. Yes, it's mine and I can do what I want, but I feel an obligation to the hobby to try to keep it original (at least for now...)
Good luck in whatever you choose to do!
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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!