I personally have no knowledge of the Kilkenny Dowlings or their related families. There are a couple of sites you might like to search on as follows: http://www.askaboutireland.ie/griffith-valuation/index.xml
will enable you to search for your family in the Griffith Valuation Surveys circa 1847 to 1865. Another great source of information are the Tithe Applotment surveys carried out between circa 1821 and 1835, you need to access theses through the LDS organisation, via an LDS approved research centre which many libraries and Genealogical Societies are; you don't have to be a member of the library or society to use the LDS Films. You can also search the LDS online site which may have a reference to your Dowlings as follows: https://beta.familysearch.org/
You may also like to have a look at the Ancestry Kilkenny site where you can post a query to see if anyone else is researching your family. A subscription to Ancestry.com can also be invaluable for resources and for connecting with other like-minded researchers, they often have a 14 day free trial offer which allows you to access all their resources for the 14 days, who knows that may be all the time you need, however I doubt it, I've been researching for over 30 years now and still have lots to find.
I hope this is of some help and good luck with your research.