Err the only Turbo engine the Elantra uses is a turbo diesel. Hyundai haven't produced a gasoline turbo engine since the Scoupe.
And in answer to your question, anything is possible I guess though it'd be easier to put the eclipse engine in a pre 1992 Scoupe since they used a mitsu engine. The Scoupe II used hyundai's alpha engine and thus used different motor mounts.