You need a new OEM ej257, the heads need to be rebuilt, that way they will clean them and there will be no metal chips leftover. Hopefully your cams are ok.
You need new oil cooler, turbo, oil pump, gates timing belt kit, have the oil pan cleaned, remove both banjo filters or replace them. I have both removed.
Hopefully that is all you need.
See my thread, got some new stuff for engine R&R, if you want to see what I did.
199,000 May 12 new ej257 short block, Aug 11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here