the silver top zetec will make that power easily with a turbo, but the rods and pistons are likely to be your weak area. VW 1.8t 20v pistons can be used in the zetec, along with some american spec (20mm small end) zetec steel rods. they should handle 300+bhp with ease. For the simple bit of sticking it in the orion, you'll need the following 1.6/1.8 escort/fiesta zetec parts - oil pump, water pump and pulley, sump, pickup pipe and windage tray, dipstick, tube and flywheel.