I agree with Ant, talk him down, but if he knows what he's got its prob not going much lower.
Original parts on this car r gonna be scarce, but if you dont care about being original...it could b worth it
I'm pretty sure if the decklid is an original vert lid for that year (kinda looks like it but can't really tell from pics), in rust free shape, it can be worth 300-600 (no joke) and therefore its worth alot more than a 500 parts car. If it was a original 57 vert that lid would b worth... shoot upwards of a $1000. But as you can tell $$$ r high for vert parts and i don't know if repros of that lid r even being made.(they might be?) I have heard of others grafting in the louvers from newer verts to simulate the look and get the extra cooling... for alot less $$$.
Is it worth 3500? Not sure, need more pics to tell you that, but from what i see it could b a really cool ride.
If you like it and have the $$$, and dont car about it being original, than it could b a diamond in rough...
Like John said " buy with your head not your heart"
2@cent