The hose on top looks like an oil line form the bypass oil filter. I would assume that the hose on the very bottom is disconnected also. Both of these hoses go to the left side of the block.
The hose connected to the side of the intake manifold goes to the vacuum wipers.
Do you have a service manual yet? They are very helpful, and available reprinted from the usual parts suppliers. I recommend reading it, or at least looking at all the pictures, it will help you learn a lot about your truck.
Good luck,
Grigg
