I would do a 1.8T, your box would go on but it is unlikely to last that long. I would convert to a cable change box, either from a mk4GTI or a VR6 Golf not sure if you had an manual Passats here. You would need a 4 cyl 228mm flywheel from an ABF/2E etc and a VR6 clutch.
For brakes, you can stay with 4 stud and fit G60/Cupra 280mm discs. If you go to 5 stud and VR subframe, you can get 288s.
There is going to be some fabrication required for any conversion but there are companies about, like QPeng that have most of what you need off the shelf.
Have a look on vwvortex.com loads of info on this subject on there.
Gavin
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