While not impossible it would require a great deal of modification and probably replacement of the original 500cc engine with a modern engine.
Allowing you could find a reasonably priced Punto or similar to get the parts from you are probably looking at $2000 to $4000 in labour costs to make it work.
A fiat 500 abarth nowadays is a pricey £17,500.
In the US, Fiat 500 Abarth is $22,700 including destination and the Richard Petty Driving School Experience.
"This is the Life" by Amy MacDonald.....love that song!
On a Fiat 500, the OBD socket is located right in the front panel. You will need to take apart the panel in order to locate it. It's near the underside of the steering wheel.
In Europe, the Fiat 500's fuel tank hold 35 liters or 9.246 gallons. This includes an approximate reserve of 5 liter or 1.32 gallons. In North America, the Fiat 500 has a redesigned fuel tank that holds 10.5 gallons or 40 liters. This includes a reserve of approximately 1 gallon or 3.8 liters.