gearbox, exhaust manifold, downpipe and cat. can prob fit this to your old zaust but id get 16v/vr one. will bolt up to your existing shafts, but you'll need the cable shifter. then its a case of using seat abf/tdi hydro->cable clutch kit, or fit the master cylinder and pipes to your pedal box. thats all you need though, the hole is already there just need the clip on the end and it pops right on your old pedal box.
corrado loom and ecu can be used but it may need a couple of tweaks to suit a mk3, mk3 vr loom would be direct fit. just make sure you get right loom for your car, as early cars have lighting and engine loom separate, later cars its all combined. can use either setup but if you get the wrong type for your car it'll take more effort to get it in there.
oh and you may need a vr6 fuel pump, early vr uses a 4 bar pump, but later models seem to use the same one as the gti/16v. need to get the right coil/coilpack to match the vr loom you are using, and early ones use a different ecu relay to the 8v. later ones dont have ecu relay at all
