i wouldn't pay for a rusted shell, yes its a rare car, but with the front end/frame damage, rust and trying to save it you'll be taking on a very large project involving a lot of your money and the car won't have a resale value if you ever decide to let it go. now if there is a motor and trans in it then its a different story and is worth a little bit if the motor turns on and you can verify the transmission will move the car.
with a salvage title and frame damage in the past most people wont give you 2K for it even if it was 100% fixed.