UCE is Unit Construction Engine. This is the new model engine that you have. It means the engine, transmission, and primary drive/clutch all share the same oil. These items had separate lubrication systems in the older style engines.
What you refer to as the carb is called the throttle body. It contains the throttle butterfly, just like a carb, and the fuel injector.
Do not loosen or adjust the throttle stops or anything else on the throttle body that you don't have to. If you do, you'll need to do a lot to get them back to the right settings. The only thing you should ever need to touch is the big brass screw on top that's set in a well. This is the air bypass screw and controls the idle speed.
To make getting the hose off the throttle body easier you can disconnect it from the bike. Remove the rubber hose from the air cleaner and remove the nuts that hold the manifold to the cylinder. Take care not to lose the o-ring, it's reusable. You can remove the wires that connect to it as well. The fuel line and the throttle cables will still be attached but you should be able to rotate it and get to everything pretty easily. Attach the throttle body side of the hose first, make sure it's longer than you need. Then push the line through and get everything where you want it. Cut to length and CAREFULLY attach it to the fuel pump. As already mentioned, make sure it doesn't rub against anything like the edge of the battery cover.
The fuel line is already connected out of the box. The front wheel is off, but that's about all that needs to be put together. That, and lots of things need to be tightened and/or adjusted, but the bike is mostly assmebled already in the crate.
Scott