I think I'm missing a nut.

You also need a large thick flat washer. Mancini Racing Crank Bolt, 2.25" Long
As for the pulleys: The pully clossest to the timing cover is for the AC. The one built into the damper is for the alternator and water pump. The one on the front is for the power steering. Both the AC pulley and PS pulley bolt to the damper. To remove the AC pulley you must remove the damper from the engine to unbolt it. (don't throw it out, offer it for sale )