I PM'd back to Princepembroke but we may as well all share it :
I don't have anything for TACA after 1956 until the 1970s.
Off the top of my head I don't recall them ever doing transatlantic flights or having a type able to do so. Once again it could possibly be some ad-hoc charter work they might have obtained, operated for them by grey-market charter operators out of Miami.
TACA themselves in 1960 had nothing more than a couple of DC4s and some Viscounts, used on their US flights to New Orleans (their US base), which lasted until they bought jets. Not really transatlantic material by the 1960s.