I have contacted the Sinking Spring Presbyterian Church in Abingdon, Virginia.
The object is to see if they will recommend someone to search the marriage record of my great great grand parents to see if their parents' names are recorded.
If so, that would be a tremendous break through. It might be possible to determine if these parents were the first of our line in America and the location in South Carolina where they settled. This church (though not this building) is where my gggf&m were married in Janurary 1815.
Also, I have contacted Debra McCown in Abingdon who has been very helpful and may be able to come up with a McCown contact in northeastern Tennessee who has done a lot of genealogical work related to various McCown lines. As with all things genealogical, none of this may pan out, but never the less some very helpful people already have been encountered in the search.
Another goal of this search in Abingdon, Washington County, VA is to locate other male McCowns willing to take the Family Tree Y-DNA test which could give us an indication of whether or not our lines are related.