I was working on another subject when I got diverted by a map of the Tre Fontane street track in a Southern Rome suburb at the official Baconin Borzacchini website (thanks to Guido for the link). As the location of this track seemed to remain a mystery, I had a go on it and...
...after a few hours of work I found the track via Multimap.com. It can be seen at this crop.
This is an overlay of the track to two Multimap crops (the track is in dark green) :

The circa 4-kilometer long straight at Via Ostiense is remarkable. Madonna!
The river along Via Ostiense is the Tevere. Note that the track encircles the EUR neighbourhood. Therefore I generated the drawing below, that shows Tre Fontane (in dark green) and the street track proposed for the stillborn 1985 Rome Formula 1 Grand Prix (this one is showed in light green) :

And this is the Tre Fontane lay-out from Daniel King's Racing Circuits website - to which I added the street names.

Hopefully this will be of help, and someday an enthusiast - calling Guido, calling Barry Boor


Cheers,
Muzza