[Illusions]

you will need the complete drivetrain. engine tranny and rear. the v6 had different tranny's and rears. you will need an 8.8.

If your going v8 a carbed 5.0 could possibly work with the t45 tranny you currently have but you would want to beef up the rear to a 8.8 minimum. I'm not sure if the motor mounts would need adaptors or not.

Do your research and decide which would be cheaper and more reliable. also keep in mind that an engine older than your model year vehicle is illegal (federal law) to be swapped into your car and street driven. My Blazer will need an LS1 or another 4.3 v6 if I want to sell it or if I move to an emissions state.