There is little certainty regarding the existence of a "hardcore" version of this film. In fact, the one you see here already includes several shots with explicit genitals, and some simulated blowjobs and quite potent lesbian acts. I don't think you'll find a more explicit version of this film.
However, it should be noted that much of the adult industry at the time was controlled by the Mafia, and many of its members still firmly clung to their Catholic upbringing. The historical account, although fragmented, specifically points to this fact as the reason why the film never premiered in New York and only played for a few days on the West Coast. To date, availability has been limited to a low-quality VHS release and an HD remaster, which, according to some less than reliable sources, is incomplete and was quickly withdrawn from the market, perhaps due in this case to other types of pressure, more derived from the reactionary nature of most American legislators.