James McNally- County Westmeath

I'm seeking information on my GGGF, James McNally. He was born ca 1830 in Cty Westmeath, Ireland. He immigrated via Phila, Pa in August 1853 from Londonderry on the Ship 'Rockaway'. He settled in the Upper Merion- Conshohocken areas of Montgomery County, Pa. He married my GGGM Marsella Meehan (b. ca 1831) and one of their daughters was my GGM Catherine, who married my GGF Patrick Nally/McNally.