I have seen a number getting about (FI motors), but no personal experience unfortunately.
A word of warning on late type 3's is rust rust rust!! I am close to getting a '73 fasty back on the road and have been surprised how little rust is in it, especially as I have had a number of type 3's and know where the rust is and how bad they get.
Unfortunately the rust starts from the inside and is not visible until it breaks through.
The easy to see bits are under the window rubbers, under the sound deadener on the floor pan, spare wheel well, inside the doors.
The hidden ones are the scary bits, inside the chassis rail the rear bumper attaches too, sills, the strengthening bracket up high inside the front guards and inside the fresh air vent. On fasties in the rear pillars, on the wagons in the roof (rear corners)
As I have stripped mine in the process, I have flushed these areas with a gerny and blased compressed air to make sure it's as clean as possible then flooded with fish oil then the black tar stuff.
The worst is the fresh air box. I removed the fan, and took the hard decision to cut it open in the boot area. Glad I did as there was rust breaking through, if left then put into daily use would not take long to rust through, and would not be easy to fix.
If you have a great car, you need to make sure they stay that way 🙂