ok, for a cylinder head, you need to buy a normal 16v cylinderhead from a vw dealer, then take it to some one that can forge it for you, in malta we have a person who can do that, you can give him your cylinder head and then pick it up a week later forged
then for a turbo, there are a lot of turbos on the market, you can just visit
www.overboost.com and pick a turbo from their.
then of course you would need to change the chip, you can put a superchip, here is a link
http://www.geocities.com/zoqditeam/chips.html or maybe a dta
http://www.geocities.com/zoqditeam/dta.html or a perfect program to program your chip, here the link
http://http://www.perfectpower.com/products/smt6.asp
hope they are enough