Simon, Tony Knight @ Knight Racing Motors in South Australia would be one of the best people to be speakng to regarding the machining, final assembly of the 2.2. He currently does a great deal of the machining for the top engine builders in Australia. His work can be seen of the RS liberty forum & this site you will find further insight to his builds with photos.

I have been getting my machining done through him as he does CNC machining of rephasing of the 2.5 ltr oil holes in the non heat treated cranks also the heads.

IMO hold of purchasing anything other than a RS closed deck block before you talk to Tony directly.