The only anecdote I have seen is one reported by Opie Read in his book _Mark Twain and I_ (1940) -- and unsubstantiated. Read states Twain told a group of men that he met James in a "small town store" in Missouri and James told Twain "Guess you and I are 'bout the greatest in our line" (Read, p. 11). Writer Max McCoy used the report of this meeting to write a novel of alternative history with James proceeding to tell his life story to Twain. McCoy's book is titled _Jesse: A Novel of the Outlaw Jesse James_ (1999) and rereleased in 2016. Barb