He was born in 1823 and married 1844. Not entirely sure when he died. I have a candidate but can’t prove it’s him. There’s a few Hugh Rourkes on Griffiths Valuation, some of whom may be the same person but they’re too disparate to all be the same guy.
Have you traced descendants of both sides O’Rourkes and done DNA tests to see what, if anything, they share?