I have respect for Norton. However this is a no brainer . Lewis either blasts him out. Or if he's not in that mode , its easy points win.
Lewis probably stops Norton but Norton might give Lewis a very tough fight. Lewis is a little taller and has a similar advantage in reach. Lewis would be about 20-25 Lbs. heavier. Lewis was a great puncher but Norton did manage to hurt most of the fighters he fought. From mid 1970 - thru 1978 he went 25-4 (19). The losses were to Ali (2 out of 3), Foreman LKOby 2, and Holmes (split-decision). The only real beating he took during this stretch (his prime) was from Foreman. He was robbed vs. Ali in their 3rd fight, all 3 of their fights were close. His loss to Holmes was very close. During this time he beat- Henry Clark, Muhammad Ali, Boone Kirkman, Jerry Quarry, Jose L. Garcia (avenging an earlier loss), Pedro Lovell, Ron Stander, Larry Middleton, Duane Bobick, Lorenzo Zanon, and Jimmy Young among others. Only Ali and Young went the distance. Don't let his other KO losses cloud your judgement. At Norton's best only Foreman was able to finish him.