I don't think Fury backs up Norton consistently, and Ken wasn't exactly weak. Norton will hit Fury with overhands and take the win.
Norton was Ali's kryptonite, partly due to him being one of the few that outreached him, but I doubt he would be Fury's due to the size/reach/weight difference.
TALE OF THE TAPE FURY Height. 6’9” Weight 273 lbs Reach 85” NORTON Height. 6’3” Weight 206 lbs Reach 80” Norton gives away 6” in height, 67lbs in weight & 5” in reach I hate to say it but Fury and most of today’s Heavyweights are at least 2 weight divisions bigger than their 70s & 80s counterparts
Bad matchup for Ken. Fury is too long, too big, too everything for Mr. Norton. Ken would give it a go tho for as long as he could
He was passed his prime but nothing like a shell. Wlad is perhaps the greatest athlete to grace heavyweight boxing history. He could probably walk in at 275 lean if he wanted, and still move like a ballet dancer.