In Italy, the Fiat 850 Abarth OT1000 was put to the test immediately after its introduction. I found some pictures of this enviable labor.

850 OT1000 1

850 OT1000 2

850 OT1000 3

The technical data from Swiss magazine Automobil Revue:
850 abarth automobilrevue65

I also found a rear view of a 1600OT; brute force:
850 abarth ot1600