Joint near the thigh, and then stick the probe into the breast and anyplace else you want to check the temps to make sure you are OK.
Your cooker may not cook evenly, since we don't have a clue as to what it is.
I wouldn't close the neck off to retain moisture or flavor. If you got the seasoning on the inside, it's not going to pick anything else up in my experience. If closing the kneck off does anything, it's going to steam the inside of the bird faster than the outside can cook, and throw your temp readings off depending on where your probe is.
You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer. --Frank Zappa
BOOGITY, BOOGITY, BOOGITY!!!
Recipient of a Huggies box!
Shut up, and cook!!!!