1279 made I am thinking entirely off hand. If I am wrong, I can't be by far. Anyway, 144 would be all, not just restored or driving, and it is a fluid number. Registry's become obsolete pretty quickly.
I would say a few are in regional museums and collections which have no allegiance to a club. Guesstimate 20-25, that's less then one per state. A few more in salvage yards with the Dragon and gold removed, look like Manhattans.
So, 200 would be a fair guess of the total number left. Hopefully more.