Hi Debbie I saw your request re father's name of John Boyle. I do lookups for anyone who wants information from the records here in S.Aus. and I found the following:-
1. John Boyle, born 19th March 1861 Adelaide District Adelaide to JOHN LEIGH and CATHERINE BOYLE reference book 20 page 62 symbol "X" denoting the birth has been registered under another surname as well.
2. John Boyle LEIGH born 19th March 1861 Adelaide, District Adelaide to JOHN LEIGH and CATHERINE BOYLE symbol "X" reference book 20 page 62
These records are the only ones for a person named John Boyle born in 1861, although this John was not born in Port Pirie, but in Adelaide.
I hope this is of some help to you.
Please feel free to contact me again if there is anything or anyone else I can look up for you.
P.S. Just out of sheer curiosity I'd love to know the name of his father on his marriage record.