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FWIW, powder coating won't always work on the likes of valve covers (e.g. mine ) The alloy, being porous, allows the engine oil to permeate (?) through to the outer layer of the material making adhesion difficult. That's the theory that I've heard and probably accounts for why p c did not work on my valve covers.
Used, porous metal can be problematic. A good powdercoater will clean the pores as possible and then run the parts through the oven at higher than cure temp without a coating to "outgas" any contaminants. I've done valve covers and case castings. Prepped properly they should be no problem.