I have also posted a Quiery about this Long Family to the RootsWeb LONG Message Board:
"William A. LONG (b abt 1812-23 - SC), of Milford, Ellis County, TX" (27 Jul 2014 7:15PM GMT)http://boards.rootsweb.com/surnames.long/10498/mb.ashx
The 1860, 1870 and 1880 Census records for William A. LONG are identified in that post.