VR6 motors aftermarket rings/pistons tend to have oil/smoke issues. I have seen a lot of people build VR6 motors over the years and sell them or part out the cars shortly (6month-1year later or 2,000-10,000 miles) after completion of the engine build up. I know of a friend who just moved to Texas that built a VR6 turbo and bought a Schimmel Built long block from a person that parted out his Turbo setup and he has had oil issues too. With VWs factory bottom ends hold up best and the best vw motors to crank the boost up on are motors that came with boost from the factory.

Also if you plan on using all of the 470whp and the torque that goes with it then plan on having a bunch of transmissions handy. 3rd gears specifically. BTW is it this car: http://forums.vwvortex.com/zerothread?id=2660629