I was lucky to see it in 1978, it was fantastic. The faith of the people was overwhelming.
Lucky you! I would love to have the opportunity to see it. There was an incredible show recently on the History Channel (will try to link) that had Hollywood professional artisans/special effects artists re-create the face of Jesus from the Shroud - incredible.
http://www.history.com/shows/the-real-face-of-jesus