Before we start crying "fake news" let's go to MGA Guru Barney Gaylord's page on the topic where he regards 150 ft/lbs as a minimum:for the slightly smaller MGA nut:
Barney is the guru and I can buy his reasoning for the high torque, but when he says a normal human can't strip the nut, I beg to differ. Although it is a bit smaller than the Healey nut (I don't know how large an MGA nut is), as I said I stripped the nut on my MG Midget while trying to turn the left-hand nut the wrong way to get it off, and I wasn't using any extraordinary breaker bar. Maybe I'm not normal? Whether it's doing any damage internally or not, I don't know since I haven't removed that Lok-Tited nut in more than 25 years. I can't remember any extraordinary effort to get the Healey nut off, either, other than needing an octagonal socket.