<So far as I know, he was censured and forbidden from teaching Catholic theology>
Even that is overstating the restriction placed on Father Curran.  The Vatican declared that he could not teach on a pontifical faculty.  He wanted to stay at Catholic University and proposed that he would teach social ethics -- not sexual ethics -- in the school of philosophy, not in the school of theology.  Cardinal O'Boyle did not allow it.  He could have taught at any Catholic college or university in the world, other than on a pontifical faculty.  No Catholic institution hired him, or even offered him a position (as far as I know).  
Fr. Curran has been for many years, and at the age of 83 continues to be, professor at Southern Methodist University.  He is, and since his ordination in 1958 has never not been, a priest in good standing of the Diocese of Rochester.  Pope Francis should make him a cardinal.