I suspect the risk factor in buying a 20 year old Porsche may be much higher that a 20 year old Morgan in terms of maintenance and repair, perhaps more so in that it seems early water cooled 911`s have been known to require whole engine replacement in what sees like a rather high parentage of production numbers...?
The amount of extra complexity involved in an old Porsche regardless of it`s initial build quality, kinda causes me to think back to the oft quoted line from the Clint Eastwood "Dirty Harry" film... Do ya feel lucky punk...etc.etc.etc. (-: