Interested in your posting as all my Armours originate from Johnstone,Renfrew SCT. There is a Mary Armour age 3 in the 1881 census daughter of James and Janet Armour living in Johnstone who could be worth following up. Also the McIlravey. Have you considered it might be spelt McGilvray,a more common Scottish spelling. There are several Malcolm McGilvrays in the 1881 census living in Greenock not far from Johnstone. Mail privately for further discussion.