If you look at it as a project of love, do a majority of the work yourself, labor is what costs more than the parts by three times easy. If you can do the work yourself except for the actual painting, by doing the prep yourself, you can have a really good paint job at a reasonable price, rebuilding the engine, you can save a lot of money yourself, interior removed from a car and delivered for recovering is a lot less than taking the car in and having it removed, done, and reinstalled, redoing brakes and suspension bushings is not difficult, time consuming is the hardest part. If the car was running and parked, a matter of cleaning, regasketing, painting, replacing some worn parts here and there is a lot less than one would expect, as long as you do it yourself.
If she has 4 doors, she is worth less, if she has a slant six she is worth less, but, if she has 2 doors she is worth more, and if she has 4 doors and a V8 she is worth more, but 2 doors and a V8 is worth the most, add a 4 speed and she is worth the most.
On the other hand, if what you are doing is trying to justify getting rid of the car, well, you won't recoup your money from the car for another 20 years if you are simply be taking it to someone else to do, it was a fairly common car, so sentimental value has to go a long way, and if you are asking these questions, it does mean something to you.