The inside left and inside right would drop in to where the half backs started leaving a 4-3-3 modern formation when defending. If the 2 wingers play forward that stops the opposition full backs getting forward even in todays formations. If Lua Lua and Murphy are near Hulls penalty box...
I dont think it would make much difference as the Centre Half inevitably dropped back between the full backs and usually the 2 wing halves had one attacking and one defensive so you had an adaptable back four. The difference would be in the attacking option.
This based on the old 2-3-5...