Being an old fart and having lived in Alaska in the '70s, I am familiar with the original. I never did care for it, it tasted awful, maybe it was the way it was cured, but my understanding is that it is an autoflower. (ruderalis). Didnt' like the high either.

I have never tried to clone a ruderalis, but threads here say it does not work. There are also threads that mention that the original line is gone forever and any thunderfuck is just relabeled something else.