Cant answer your question but I had a strada I 1.5 and a strada II super (1.6 I think) followed by a couple of cromas . Will try to find a picture of the Strada I to post for you Jon.
Are you trying to fit a gearbox to the croma? The 1300 Strada gearbox definately won't fit. Ask on the guycroft forum or on sportingfiatsclub for the definative answer on your gearbox question, I would have thought there were options for your problem from cars other than the Abarth ZF box.