Thanks so much for stopping by, we hope that we can be of some help with learning more about your Irish heritage!
I took a quick peek at a few resources but I'm a little confused about the date given for your gg Grandfather's birth. If possible, could you clarify if he was born in 1943, or if that was the date of his passing?
If he was born before 1864, records were kept in the form of church and parish records all the surviving records have been sorted into county-based genealogical centres
Another resource that may be of some help is Ireland Reaching Out
, which might just be able to help point you towards more answers.
I do hope that this helps and look forward to hearing back from you!