Hi, in 1876, James' property was valued at 185 pounds 15 shillings, and John's property was valued at 22 pounds 10 shillings.
The LDS (Mormon) Family History Center has a wonderful microfiched IGI Index for Ireland, (mostly civil registration for the 1860s, but other dates) and you should be able to find several references to your surnames. The FHCs are free and open to the general public, located in most towns in the USA and some elsewhere. The fiche are usually kept in catalogue card type drawers under "British Isles." There are 1-4 little black squares of fiche for each county in Ireland. Be sure and have the FHC volunteer place the largest magnifying lens into the microfiche reader for easy viewing; you can make copies right at the machine with the touch of a button! While you are there, check their FHC Catalogue diskettes for other resources they have on microfilm for Co. Antrim.