Nice Size Bird
You have a nice sized bird there! Smoked them that size and a bit bigger on my SnP. We eat turkey year round here at home- good slicing for sammies.
For safety and taste/appearance reasons I have always aimed for 325 when smoking turkey or chicken. Works out perfect everytime. If you shoot for 325 on an unmodded SnP, when you have a temp drop or spike, you will still be okay.
Never stuff it except for a couple wedges of orange, limes or lemons. Sometimes a quartered onion.
If you use a handheld probe thermo, stick the thick part of the thigh as well as the breast and pull it off at 165 F then let it rest a bit, It can be higher, but I wouldn't pull off a big bird like that under 165.
There is a lot more great advice above me on this thread. Take it all into account and figure out what you want to do. Don't be shy about asking more questions, we're all glad to help you out!
Good luck to you and may the TBS follow...