Hi Steeve & Skoosh,
I used Steeve's advice, and then applied it with Skoosh's map (great map by the way), and yes, I have it quite clear that Doire Na Furan must be in Upper Loch Torridon, very close to Torridon itself.
By the way, it's strange that the name Doire Na Furan dissappeared, it was full of households in 1841.
Cheers,
Francisco