Oil change only if close to whatever OCI you follow; otherwise, should be fine.
Mobil 1 is fine.
Plugs should be fine to 100K, give or take; colder plugs might be needed if you were going FI (i.e., turbo or SC), but not NA with bolt on's.
BUT -- do you have a baseline? If not, it will be much harder to determine how much you gained over stock from the breather mods (although you can compare before and after tune, of course).
What kind of dyno?
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