Wont take much at all.
Your car already has a hydrolyic clutch.
Would would literally unbolt the 16v and gear box, and bolt the vr6 in. And plug the VR6 engine loom into your fuse box.
You would just need the engine, gearbox, engine loom to fuse box, rad, pipe work. Exhaust is also the same size i believe. Could probably do it in a day.
Obviously would need new engine mounts etc, but they are all cheap from car factors.