I am using the same type of plugs and have over 2 months on mine. Copper and a step colder are a must.
I would not suggest going over 100HP. But if you do decide to go that route you will need larger injectors. Trust me on that one I know from experience. SVT's have a 19lb injector and I maxed it out at 6000 RPM, others only have 17lb.
Good luck and learn as much as you can before you start spraying.
2002 Mustang GT
H&R, Bilstein, NX, K&N, Bassani, and Prochamber
03 Cobra wheels, Goodyear Eagles: 275 fronts, 315 rears
325HP and 433 ft-lbs at the wheels
Old Car:
2000 SVT #463/2150
Best #'s - 268.5HP and 275.8 ft-lbs at the wheels
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