Aiden, I'll talk to my friend, see if he has any plans for this motor, will PM you with the answer. I bet Chris P would know an old diesel mechanic that can explain the liners for you. I found the SR20 liners on an American website when I was looking for KA24DE pistons, but can't remember the website.
D , the guy with the L18 can be contacted at Waterhouse Auto Care on 02-4721-7227, ask for Jamie. I tried to pick his brains, but he needed to build a motor for the next weekends rally, so I wasn't going to interrupt him for too long. He uses the 120Y in state rallies & khanacrosses, & as I was selling him a Z24 crank, I think he'd be willing to do this conversion for other people.He did mention that crow cams had some blank camshafts, but he just used the standard cams in his motor.