What GM engines will interchange
Other 3.4L engines from other cars of similar vintage, probably 1999-2005. They used that engine in a lot of cars, like Alero, Grand Am, Grand Prix, Trans Sport/Montana, Venture, Impala, and probably some others I can’t think of now. If it comes out of a smaller car, like a Grand Am, motor mounts will need to be changed, but the engine itself will work.