You will get that with that buget build but ??? How long it will last the st170 has forged internalls as standard but they are not great!

If you want to build a zt it will cost more than 1k!
£160 2ltr blacktop engine
£755 PEC forged pistons and rods
£28 thick frs headgasket
£50 frs inlet and injector rail
£80 frs ex manifold
£200+ frs turbo
£600 omex600 or better
£300 for other bits and bobs then you'll need it mapped