I have a pair of engine cases sat outside if you want them?
If you've gone to the trouble and have the engine out, you might as well rebuild it. I have these cases as I bought a 'donor' engine that had a knackered top end due to the cam chain jumping a tooth (apparently). It cost me £80 and i just pulled the gearbox out of it as I new the rest of my engine was in good shape.
It'll only cost you a days work and a set of gaskets/sealant to split the cases and transfer the insides.
In NW London.