Those are the plugs I recommend above all others.
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Good choice.
I've gone through two sets of those exact plugs and I love them. A guy at Advance Auto recommended them to me-its the only plug he runs in his twin turbo Supra.
I'm running a 10:1 motor w/ a JWT Popcharger only (I started with the suspension & slowly making my way to the motor).
Of all the NGKs I've tried, the Iridiums are the only ones that really make my motor sing when I get into it.
Don't have any dyno #s to back it up, it just seems to GO
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in quite a rowdy unbridled fashion with the Iridiums.
Its not totally a "seat of the pants" thing, there's also this SOUND, a hungry wailing sound. A beautiful spooky wail.
I also get three-four more mpg than with the coppers or platinums (my least favorite).
Strangely, the idle is a little rougher with these plugs than any of the others...interested to see what you think.
Rob