you can get it done for less than £2k using stock parts, it wont be as reliable and you wont be able to run as much boost, but it will work. brackets need to be made and the engine management will need to be changed. unless you have big pockets or you are handy and can carry out most of the work yourself then i would leave it alone..
as you have an 8v the best option for you would be an eaton m45 found on bmw mini coppers and some mercs.
megasquirt is one of the cheapest standalone engine management systems and can prove to be very useful and flexible.