4g63cylinder head oring

hey guys, need some opinions on oringing my evo 7 4g63 cylinder head as i am planning on running at least around 42-45psi of boost/roughly 800-900wph(e85). I have got some 1/2" L19 studs to go with it too. Now question is who in nz does machining work for orings ? and wil just oring on the head itself be enough? Also head gasket options...leaning toward oem evo9 hd gasket as i see many have been successful in states.

Lyn Rodgers Automotive in Auckland or Collier Motor Engineers in Levin would be my two picks in the North Island.

Typically you leave the head alone and o-ring the block. I've used HKS, OEM and Cosworth gaskets with good results.

thanks Andre, ill get in touch with lyn rodgers.