Iridiums are a pain to gap. There prolly at pre packaged gap which is any where from around 36 to 46. Boost on a jz will blow that out fast.
Get ngk coppers like habenaro said. Pn 4644. Gap to 25-28 and should be good to go.
When checking the clearances the opposite side of the lobe is against the shim right?
If so see what the actual clearance is. Then write down the amount you need to be in spec is. And when you remove te shim measure ot and subtract the amount you wrote down. Makes it easy.
Also if you got...
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