Searching for William James McClure married to Sarah Montgomery

I am a decendant of William James McClure born in Ireland no date. Married to Sarah Montgomery. He was a cousin to James Gillian. Gillian sent him passage fair to the US. These two had six children that I know of. The third son Robert Montgomery McClure was born 5.8.1842 in Ballymena. Our family refers to William James McClure as our "A", Robert Montgomery McClure is A.C. so I am ACgabb. I would like to know more about Williliam James McClure and his decendants if possible.