Hello, First for your question, technicaly, you can do it, hub's have the same diameter (40mm), but you have a problème, brake système don't mount, you need a complete stub axle with the hub.Next, i have the same car, with approximately the same project, but i directly swap the engine with an AAZ. If you don't want to swap, you need :-AAZ injection pump with injector line and injector.-a turbo.-drill a hole in the crankcase for the return of the turbo oil.Personally with my aaz i will instal tdi break, mk4 tdi gearbox ( much longer) and i want to build a homemade mechanical system for control a vnt turbo.Good luck with your project
Yeah, gearbox is an issue, i forget that i mount the aaz axle with the engine x)For the power, that is not really true, you can make 120HP for nearly nothing, a kkk k14, a custom boost pin, governor mod (4 or 5 mm shim, max fuel adjustement, timing set a 0.95mm/1mm, an intercooler, and you have approximately 120hp.For more, you can use a bigger pump head (10mm) with a 3mm camplate, but then a don't know about timing...I'm from france and i see a french thread about an mk2 with an aaz and 200hp, don't pay big money for it, juste take a k24, fuel up the pump (a lot), big intercooler and some pump modification (don't remember what)