What's he going for? A full-on numbers-matching restoration? Or a nice driver? If I owned that car and had moolah, I'd put the original engine/trans away and install a 2.7L.That colour is fantastic.
Basically as or better than new. I'd keep it forever.
I think the air cooled 911 market is going to collapse and if people want one, buy it and own it for yourself, not as an investment because long term, the escalation is either over, or close to over.