My book has the O/U at 320. Last several years totals have been 221, 255, 300 (2 OT), 268, 240, 242, 285, 262, 265, 280, 291, 321. The trend is toward higher scores but doesn't 320 seem high? It's only been hit once ever.
Edit: fixed one stat. I had last year's game at 301 but it was 321.