Do the hydro clutch, don't do half a job. Its easy to do, especially with engine out, its just fiddly and laborious, but certainly not hard. Getting the corrado box into position with fuseboard and wiring etc in situ can be fiddly.. If there is a difference from flange to flange distance on gearboxes then shafts may need changing, if not just use the mk3 setup. As said earlier, I'd use the pas off the mk3, then you neednt change anything, just offer the whole subframe, including engine,gbox etc still attached up to the car and bolt it. You will need to change steering uj to pas model one, mk3 one should fit to your mk2 column (so I'm told, I changed my whole column)