Oddsmaker sets Peyton Manning’s passing yardage total at 323.5

The Seahawks have allowed two passers to exceed 300 yards all season. Peyton Manning, meanwhile, has thrown for more than 300 yards in 13-of-18 combined regular-season and postseason starts. What we have here is a compelling matchup — and the ingredients for the sort of proposition bet Nevada sports books love to post this time…