I don't feel a WSM was really designed to run at 350 - They perform much better in the 220 - 270 range... Not to stay you can't get it up to 325 -350, its maintaining the temp as Brett and others have alluded to... its a lot of futzing, especially on a Holiday! In the past with bigger birds, we've started them on the WSM then after a couple of hours of smoke and they get their color, we move them to a kettle to finish them off - However, depending how big your bird actually is, it might be on the cusp of fitting in a 22" kettle - (If you happen to have a rotisserie for your kettle, you can add the ring - this jacks the lid up high enough to accommodate the bigger birds. )