v6 or inline 6?
if it is an inline 6, you need to swap the k-member.
if it is a 3.8L v6, you just need the normal things (besides the engine assembly itself):
complete exhaust system
keep your p/s pump (not the one on the engine)
trans bellhousing (for stock trans) or new trans
some creative wiring (not many original harnesses are available or 83's, or really needed, since its just for ignition and starter)
you might be able to keep the trans (but it wouldnt last for long).