what spark plugs for Stealth Mare

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hey guys, so im finally able to start throwing some more money at my baby racecar and i want to get your thoughts/recommendations on spark plugs. im considering going with oe motorcraft plugs, but i also figure why not upgrade if itll help in the long run with my frpp 9mm spark plug wires and msd coil packs.

so far im looking at:
oe motorcraft (heat range 3)
bosch: platinum+4 (HR 9), super plus (HR 9), double platinum (HR 7)
accel: c cut (HR 6)
ngk: standard (HR ?), iridium ix (HR ?), laser iridium (HR 5), laser platinum (HR 5), g power (HR ?)

what do you guys recommend?

car makes about 220rwhp, i autocross it and will be getting on some road courses in oct, like i stated above i will be getting the frpp plug wires and msd coil packs. currently have a airaid cai ram air and bbk 78mm throttle body/plenum combo, so not too sure how, if at all, those will be affecting the car. also its on 12* timing and i usually put in 89 (which is mid grade where i am)
 

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