I did a quick analysis of Udes(as) Emigrant place names in former Southern Czarist Russia. Most were coming from Bukowyna Province, Kowel in Vohlynskaya gubernia, and Balta > Podolskaya gubernia. Ran some radial searches around the district centers and found Nowe Pole (in Ukrainian)/Nowopol (in Russian), which became Ухожани = Ukhozhany in 1926 under Soviets. Today selo/village Ukhozhany still exists > Balta raion/district > Odessa oblast/region > Ukraine. The filial Jewish kahal was likely in Balta.
Map. Fidget w/map zoom to gain perspective.http://kartaonline.com/uk/obls/43/regs/886/city/8610-%D1%83
Photo of selo/village Ukhozhany today.http://upload.wikimedia.org/wikipedia/commons/a/ac/Ukhozhany
Many Jews from Balta fled to Odessa.http://familytreemaker.genealogy.com/users/b/r/o/Faye-M-Brow
This is the area that was set aside for Jewish Agricultural Colonists. Many emigrated from northern gubernias, mostly from what is Belarus today.
Now that you know your family was from Podolya gubernia you can move your search to Jewishgen and do a name search.http://www.jewishgen.org/
The Jewish Records for Balta might have been in Kamenets - Podilskij Archives, which had a fire appx 6/7 yrs ago??? Many records were destroyed. The Conservation of documents is likely still going on and being performed @ Khmelnytska oblast Archives.
The other possibility for Balta Jewish Records may be Odessa oblast Archives???
Anyone traveling from Russia in time of this family's immigration carried a passport. Turn of the 19th century Russian Consular Records can found in NARA.http://www.archives.gov/research/guide-fed-records/groups/26
I think originally surname might have been (Y)Udec/(Y)Udicz/(Y)Udych = Юдич/Юдиц in Russian or Ukrainian????? The surname looks to have origins in Belarus???? There is still an Удич living in Odessa, but I cannot find specific listing. Additionally, there is also a Pisnoy/Pisnoj living in Odessa. Address and telephone follow. (During Stalin Era Soviet citizens were also encouraged to move to the larger towns and cities for economic reasons.)
Писной К. В.
в. Космонавтов дом 62/2, кв. 47
Україна - Ukraine
Pisnoy K. V.
Kosmonat Street bldg 62/2 apt 47
Consider writing a short letter, using very simple English. If they need to use translator, it would be easier for someone, who knows basic English.
Zev was frequently anglicized to Wolf.