I agree with Sweet6, somewhere around $5000... basically roller price. That is assuming the only other things needed are front seat covers and a respray (no metalwork). I don't know what you have in mind for a motor, but I'd guess you will have 5k or so into a rebuild. Another $1200 for a trans rebuild if it's needed too.
These are fun cars and since it has high miles, you could actually use it once it's finished.