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Tomei or Kelford cams would be my choice, and first option out of your 3. Supporting mods should knock out the biggest restrictions first.
Next would be injectors/AEM or whatever EMS you choose
Lastly the manifold. My Evo 8 had a cast factory manifold similar to the revhard with a very small turbine housing and it still made 330whp at 21 psi. The manifolds were still used up to 450whp reliably, so I wouldn't upgrade it til you are ready for a bigger turbo anyway.
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