Nice find! I think I have seen that graphic now that you mention it. Totally crazy...Here's a Boston Globe article from 3/25/69 with a map and a nod to Dukakis:
Would have marooned Olmsted Park and Leverett Pond inside giant rotaries surrounded by one-way routes, and taken the (formerly) lovely stone overpass over Huntington/Rte. 9... and crapped up the Emerald Necklace for good, imho.