I just wanted to update anyone that may want to continue to read this thread. I have received the birth record for my great-grandfather, and his birth name is Luigi Angelo Laibac. With the father's name as Angelo Laibac and mother's name Maria Grazia Spagnuolo. Angelo Laibac is 100% correct for the manifest record, and Maria's and Luigi's manifest has got to be it too.
So...all of the information has cleared up the immigation dates and birth places of all of the family. Thanks again for all the information and assistance. Now on to my next question...