Got it.
Okay, so they've named it something weird...go figure. Now how about a photo from the side, unwrapped.
Given this limited view, I'd say it's a "picnic" not a butt. Little less fat than a butt and many will use a picnic for slicing instead of pulling. But this will work fine.
Load up your wood box.
I smoke mine at 225.
Plan on 1.5 hours min (8.34 pounds x 1.5 = 13 hours min). Plan on 14 to 17 hours.
Rub this with Mustard (holds the rub) sprinkle liberally with a favorite rub.
At the 12 hour point, I'd check it by using your hands (in some oven proof mitts) I can tell when they're done - if they fall apart when you grab them, they're done. If not, put it back in for 2 hours
When it's falling apart, take it out, wrap in foil for 1 hour minimum (and like Don said, it will keep for hours in foil). The take it out and pull it apart (by hand or with a fork in each hand) I like to sauce mine at this point with some of the finishing sauce.
Actually Butt/Shoulder/Picnics are hard, when you're first starting out, trying to do them for a party. They're better "done ahead" and reheated for the party. these things have a mind of their own when they want to be done.
What else would you like to know?