Found it, with this description. based on the Alfa 1300, the body is attributed to German coachbuilder Colani, but the Abarth connection is unclear. Abarth built a sleeved-down Alfa 1000cc car with Bertone for the 1958 Turin show, but neither Fiat nor Alfa backed the idea and the car was stillborn. Perhaps this car has the engine built for the Bertone car?
Done more looking, apparently it was a wrecked abarth creation that was rebodied by colani.
I wouldn't have found it without 1973/126, so it is their turn.
