NEW YORK — Time Warner publishing imprint Little, Brown has signed a six-figure deal for the life story of relief pitcher Jim Morris.The 35-year-old physics teacher last year became the oldest rookie in Major League Baseball history when he signed with the Tampa Bay Devil Rays. The as-yet-untitled book will chart Morris’ well-publicized story: A high school baseball coach and father of three, Morris bet his teammates that if they won the league championship, he would try out for the Majors. Six months later, armed with a near-100 mph fastball, he made his big league debut. The book will be co-authored by Joel Engel, who co-wrote boxer George Foreman’s autobiography. Morris was repped in the deal by David Vigliano of Gotham-based Vigliano Associates.