Ola Torsen Øverland and Anna Toresdotter Rossemyr

I am looking for information on a family from Suldal in Rogaland, who emigrated in 1864: Ola Torsen Øverland, born ca. 1830 in Sauda, married 1859 to Anna Toresdotter Rossemyr, tenant farm Stien, born 1837. Two sons: Tore, b. 1860 and Tore, b. 1862. According to naming traditions, their sons are named for their grandfathers, who had the same name, thus producing two sons with the same name. The family lived at a tenant farm named Eskjedalen under Veka farm. Eskjedalen is spelled «Espedalen» in some sources, and Veka was often spelled «Vegge» or «Wegge» by the ministers who kept the official records. As you can see, there are a lot of possible names that the family could have used in the USA: Torsen, Olsen (sons), Thorson, Olson, Wegge, Vegge, Veka, Eskjedalen, Espedalen, etc. And the sons could have used Thomas or Tom as a first name. In any case, I have not been able to find out what became of them in America. Information on these people is available in bygdebøker for Sand and Suldal: Ernst Berge Drange, Sand. Garder og folk, vol. 1, p. 584, and Drange, Suldal, vol. 2A, p. 773. Can anyone help me find these people?