ESPN publishes no stat lines for Len Dawson. His career totals, as Wikipedia gives them: 28,711 passing yards, 239 passing touchdowns, 2,136 completions, 3,741 pass attempts, 183 interceptions thrown, 57.1 completion %, 82.6 passer rating.
Among the 2,587 NFL players with a career line on file, regular season. A place deeper than 300th is not listed.