use the 2.3 bottom end for bags of tourque however you will need to bin the sump along with the balance shafts to do this you will need to have a small piece machined and fitted to the bottom of the block to fit other rs2000 or the 4x4 sump, if you remove the 2.3 sump and offer up yours you will see what needs to be done its that obvious

and dont under any circumstances use a cheap ebay turbo as they do shit themselves at any decent amount of boost, the compressor housings split in two at around a bar of boost as they are in two pieces and only bonded together utter shite and not worth the money or risk to your engine