you can gap an iridium plug just fine...don't touch the fine elctrode, just stick a small screwdriver in the ground strap bend and open it up a little, or give it a tap on a counter top to close it up a little. Be careful, they are fragile.

I use the NGK iridiums, heat range 8 for higher boost (NGK has a backwards heat range) or NGK V-power 7's for daily driving.