Bro, I really dont think you can really hit the 'upper' bicep part with a specific exercise.. however there's two parts-- the Brachialis, and Biceps brachii, when you do a curl-- both comes into play.
I would say probably the Brachialis fills the upper-outer part of your bicep.
I'd go with Hammer Curls, Preacher Curls, and Barbell Curls bro.