I think Joe Gans and Sam Langford would be great in any era. Jim Jeffries would have a punchers chance against nearly every hw of any era. Stanley Ketchel would be good in nay era. Barbados Joe Walcott could fight in any era. Joe Choynski would be a world champion today. Bob Fitzsimmons would be very good in any era. John L Sullivan im not so sure about. He fought a lot of fringe contenders as well as guys who werent even really boxers so how good was he really? I give him credit for being a pioneer of boxing though. Abe Attel i don't really know enough about. Battling Nelson wouldnt do as well in the modern era of fewer rounds. He would lose a lot of decisions. Corbett would be ok but not great today.
Langford, Gans & Fitzsimmons are the only 3 I could see being worth something, but none of the rest..
