Re: original Irish texts

The Cattle-Raid of Cooley (Táin Bó Cúalnge) (bilingual edition, adapted from J. Dunn's traslation of 1914)
http://vassun.vassar.edu/~sttaylor/Cooley/

THE STORY OF MAC DATHÓ'S PIG
http://vassun.vassar.edu/~sttaylor/MacDatho/

Also, Faraday's translation (in PDF format). search it through Google, it is online

regards,
paola