Tbh if it's a big enough project lee then buying a 1ltr won't matter. Strip the dash loom and replace it with a sport one, then it's all exactly the same wiring wise.
To the OP, yeh it's probably an x30xe. Things to note about fitment and clearance:
You'll need to cut into the bulkhead slightly to be able to have enough room to fit and remove the inlet
Both manifolds front and rear won't clear. Front one hits the crossmember and read one hits the steering rack. Because of this they both need to be custom made.
Engine mounts are custom aswell, the drivers side one goes though a belt. Which is a pain.
When you come to fit the engine, it's easier to strip it down to almost bare block, fit it, and then build it up in bay. As you just won't be able to fit it as a whole thing, just not enough room.
Good luck is all I can say, lol. C20let is easier and cheaper and more tuning potential.
Dave