Welcome, Laurel! If the plant in question was definitely collected in Central or South America, then it's unlikely to be Dendrochilum which is an 'Old World' genus primarily from the Philippines.
The Stanhopeinae include a number of other vegetatively similar genera besides Stanhopea (eg Gongora, Paphinia, Sievekingia), so pictures could still help narrow it down some. Photos showing leaves and pseudobulbs from different angles (as well as close-ups of any emerging new growths), overall growth habit, and inclusion of a ruler for scale are all useful in evaluating ID from vegetation. Put up whatever you can, though, we'll try to figure it out.
Either way, culture for most of these is fairly similar: regular moisture and fertilizer, good air at the roots (hanging basket w/ moss is a common way to pot), low to medium light. Temperature tolerances/needs can vary considerably, but most Stanhopea are warm-growing and if it's survived in captivity since the 80s then it's probably been in conditions it likes.
--Nat