I'm kind of new to this, but I just checked a couple of old streetcar slides I have which were taken on Parliament south of Gerrard and north of Queen in 1970. Parliament had big heavy-duty wooden poles, three storeys high, with the wooden box frames at the top on both sides of the street in 1970. At the very right edge of the photo we're studying there is a streetlight pole that doesn't resemble the ones in the slides on Parliament, and it's unlikely that those big wooden poles went anywhere before Hydro started its upgrade projects in the 1990s. The one in the picture looks like a standard concrete streetlight pole with a peaked top and the streetlight bracket appears to be just visible. I also looked in the distance of the slide taken above Queen and I couldn't see anything resembling the building at the right, so Ãt's unlikely that this is Parliament St.
Also, the police car is a Plymouth Gran Fury as it has the distinctive rear bumper which housed the horizontal tail lights. These were everywhere in the mid-1970s as police cars and taxis. But, is this a real Metro Police car or a movie car??? The font for "METRO POLICE" and the cruiser number don't look legit. Metro Police was in a narrow font, while this looks wide, and the crest on the door doesn't look quite right either, so I think the cruiser number is bogus and doesn't help.
Sorry not to have any definitive leads, but thought I'd add a couple of observations to the discussion.