Looks like it was taken right in front of Macy's 34th Street Entrance in Manhattan.
Not sure exactly when in the mid 70's the NYPD changed to the blue/white paint scheme from the earlier tan/white/green schemed vehicles.
As to the hood, might it be a meduim duty cab tow truck?
Here's a google map of the location now in case anyone is interested.
https://goo.gl/maps/ToPoUCfzMDG8m2MZ9
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1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights