IMM, QMP, Pettis, Eric at Jones Engine Development, Dustin Lee Race Engines are all shops in the SoCal area that do good work some not as fast as others but a few of those have very good track records with making power. Also FWIW they are almost all small shops, a couple kinda one man deals so sometimes getting in touch can take some doing but in the end you will be happy. You can google for contact info.