Given that it's a numbers matching convertible, it's a fair price. If fully restored that car is probably going to have more invested than what it is "worth" for a few years. But it would still qualify as a sensible decision based on the factory options and relative scarcity.

That's where numbers matching cars and non-matching cars diverge. If the car was not numbers-matching, it might not ever be "worth" the investment. So why are non-matching cars and low-optioned cars restored? For pleasure, not profit.