A restored SWB or longhood 911 that's been sitting frequently needs $20,000-$30,000 of sorting before it's reliably drivable. Buyers experienced with the chassis discount accordingly; pristine-looking cars without a documented 500-1000 mile post-restoration shakedown sell soft because regular drivers know to factor it in.
Post-restoration shakedown cost — the $20-30k tail
Porsche 911 (F-series) · value-and-market