My last engine done about 120,000, this engines done about 10,000,

Im not running a oil cooler but will be at some stage soon

For 200bhp you will need

Set of cams (piper 285)
Exhaust & Filter
T25 turbo, manifold with boost around 9 psi maximum 10
Decent-ish intercooler (for ease use a evo 6/7 (got mine for under £70)
FSE

And run it on minral oil not semi synthetic (runs better)

Be aware it will eat through HT leads (like every 5000)

You hit 10psi boost at 2400 rpm