assuming that:
56cm frame is for 5′ 10″ - 6′ 1″ height
58cm frame is for 6′ 0″ - 6′ 2″ height

being 6′ 0″ tall I bought 56cm frame (old racing bike built on 531st tubes)
I quickly measured front wheel - bottom bracket, just 1cm shorter than my old 58cm bike so there should be no toe overlap.
stem to be replaced by short steep one.
thinking about the bar.