have to agree 8k is not enough
what mods you have already?
a basic price breakdown of stuff you NEED is
these prices are WITHOUT VAT
quaiffe gearset plus OS giken clutch (needed to hold power) - £3200
engine rebuild(forged pistons etc still 2.0 std rods and crank) -£3300
turbo £-700-2000
manifold and custom piping - £200-1000
front mount - £800
all that lots £10000 plus with VAT and you nee dbrakes, suspension, maybe wheels, guages and other things not catered for.
If you buy parts from USA/japan and know someone who can rebuild ur engine cheap then you could, but otherwise it's very expensive. Need to spend £20k really to get that power reliably without compromising on crap suspension and brakes