Here is a car that is somewhat comparable:
http://forums.pelicanparts.com/porsche-cars-sale/859479-1981-911sc-coupe-one-owner-all-records.html
It seems comparable condition wise -- some bubbling and paint flaws. 101k miles, claimed one-owner will full records. No suspension mods.
Asking $25,995. Has been listed since 4-06-15.