hi guys I am rebuilding the motor out of my 98 Eclipse GS 420 I had a few questions about My build. I am using Crower stage 3s, I had my head rebuilt with new seals in guides and 5angle valve grind, then ported and polished along with the intake. my question is what else do I need to finish this build? my short block is factory and freshly rebuilt as well. well I need a tune? well I need aem cam gears? how much power can I expect to gain from this set up? should I have my head milled to make more compression? thank you for any help or information guys greatly appreciate it!