i think you need a few extras, not just engine and loom. it makes it easier if you have a late spec fuse box (with hazards on steering column) in terms of wiring. you need a vibratechnics engine mount, they do a specific one for the conversion. like blue said i think the exhaust needs a proper manifold to do it properly. a corrado radiator fits better and then you'll have to decide what drive shafts you use, if you'll stick to 4 or change to 5 stud hubs etc. and you may need different springs up front just to cope with the extra weight a vr6 has.