Hey Champ,
The ecotec will fit in, although the VT's have an egr valve. If you are going to do the conversion you will need to either plug up the hole into the Plenum or change the Plenum to a VS one, very easy to do. Can pick one up from the wreckers. You will need the exhaust off a VS, you will also need the wiring loom and ecu from a VS. VT's use a different sensor from the Coolant temps. In all honestly it would be cheaper to go buy another VS or VR. You would also need a VS gearbox.