billyo said:Golf engines transplant well into the Polo. The ultimate is the 16valve GTi engine or a really complicated swap to a 1.8T AEG block. An engine swap is probably cheaper than doing up the existing engine on a power gain per dollar spent basis!
waynne said:You'll probably find it is quite easy to import one from the UK or even mainland Europe. Most salvage yards will crate it up and arrange for shipping through their courier.
You might find that you can get an 8V engine more easily and they are still fantastic power plants (Some even think they are better than the 16valve ones!)