Don't think there's a connection with Jimmy Breslin!!
Don't know much about UK records, tho' I've looked up deaths etc in Family Record place near Angel in London.
I assume you don't live in Ireland? Ramsgrange is in Civil parish of St James & Dunbrody Boderan is in civil parish of Killesk - Ramsgrange wd be the nearest town / village - about 2 miles
R.C. parishes are Ramsgrange, Templetown, Suttons(Ballykelly) ... all within 3-6 miles of each other
Catherine Agnes Walsh - have you her birth cert - usually gives the townland. I wouldn't worry too much about the date on the grave - sometimes the stone was put up years later ( you did mean 1973/74??)