It has Abarth badges and rims (I think) and the poped rear end, could this be the real deal?
If you want to check and get the chance, the engine will tell you (all Abarths of that era had "Abarth" cast into the rocker cover. And the gauges had "Abarth" in white at the bottom.
Plenty of other ways of telling I'm sure, but those are two obvious and hard to fake tell tales