The rocker cover is a standard upgrade. Not sure what the carb is, could it be a Bis ? That type of manifold has been around for over 30 years. Originally designed to fit the Weber 30DIC carb but can now also be used to fit the Panda 30 or Bis twin choke carbs.
There are engine lowering kits available for the Fiat 500 to give a bit more room above the cylinder head.
The other manifold in the picture is a later & lower design.
Sent from my iPad using Tapatalk