Which Spark Plugs in a 2016 Lincoln MKT 3.5L

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Motorcraft SP-534? 542? 580? Something else? Does anyone know the difference between these?[/size]Only performance mods are Air Raid CAI, TRQ Ignition Coils ICA64254For best performance (without ruining the engine) what gap can I do? .030? .031? .028?
 
Sp542 will work also, but not really needed with 93 fuel. Shell and Exxon are currently the top performers on my list.

No harm in gapping to 0.028, stock or not, but i dont like having to gap modern plugs.  0.030 is stock on 534s IIRC.
 
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