Looking at from an outsider and never have seen the car, first guess would be anywhere from $5,000 to $9,000. Everyone's definition of "frame-off" restoration is different. And this is not a personal dig, so please don't take it that way. But there are many different degrees of a restoration. For example:
1. Was the shell, panels and frame acid dipped?
2. How much powder coating vs. painting was done?
3. How many receipts/pictures do you have to show the work?
4. Did you use all original/NOS parts?
5. How much rot had to be replaced?
6. Who painted the car and what system dig they use?
7. What kind and brakes/suspension are in place?
8. Std or Deluxe Interior?
9. AC?

And the list can go on. The reality is what Amervo says, I would be afraid to buy a restored car for a large sum. But there is also the other side of the coin and that is the seller. He/she may feel it is worth much, much more due to the time/labor spent on the car. I know I'd never get out what I put into my car. If you had a lot of positive answers to the above questions with documentation, then the price is closer to $10,000. If not, then it goes down from there.