As Mark One said, unless done properly there can be problems with setting up a carb to run boost.
If you're after an engine conversion for your mk2 1.2 it's going to cost you more than buying and insuring a better car in the first place.
Yes you can fit a 5 turbo/ volvo turbo but it's an old engine and not worth the gains. If your serious about the conversion look into transplanting the 1.2 turbo lump from the Mk3, but I'd still say buy a new car and save the money