Putting a colder plug in an engine that doesn't require it is only going to get you fouled plugs. Stick with the correct heat range (32s for anything not 00 SVT). Now if you are chipped and have extra timing, the colder plugs might be worth a try.
Unless you've done cylinder pressure changing mods (turbo, s/c, juice, or increased compression) you should follow the gap on your emissions sticker under the hood, which says .052" - .056" IIRC.
As far as broad vs. fine wire, that is something that I'm not sure about.
