I did find John Wallace & Anne Gallagher in the church records, but their son William is too young to be my William, since my William is already having children by 1819. I think the parents of my John are probably William Wallace & Hannah Cullen, who married Jan 11 1814. I'm still attempting to piece the family together, but it is no easy task. It looks like William & Hannah had Thomas 1815, Mary 1817, John 1819, Ross 1821, Jane 1823 and William 1827. They usually list Carney as their address for most children.
Thank you so much for the post, especially since you may or may not be related to the Wallaces, I appreciate the time. Thanks also for the tip on Ballinful & Ardtrasna!