I would recommend getting a complete well running crash damaged Corrado vr6 if you want to keep 4x100 wheels, if not a Mk3 vr6 which uses 5 stud was my 2nd option. The Corrado has the benefit of the 2.9 engine and the conversion is slightly easier due to not having to change the rear end to 5 stud.
Buying a running car means that you know all the parts actually work. If you buy individual parts (like I did due to lack of space) to build up the conversion you will run into problems which are frustrating as hell! It's a larger initial cost but in the long run it is likely to be the cheaper option.
Early 2.8 Mk3 OBD1 engines are dizzy, not coilpack and they do not need to be deecoded. Thoroughly check the history for the engine. When things go wrong on the vr6 things can get expensive, quickly. If looking at a car with over 100k which is likely check to see if timing chains have been done. They were meant to be lifetime parts if the engine is very carefully cared for. If history is patchy then budget for replacing these.(Parts alone are £150ish I think). When they are on their way out they are noisy, sound like marbles rattling around.
Also join mk2vr6. Great bunch of people and there is an insane amount of info and advice from all over the world.
