I would say that it's a matter of seeing what works with your GP. Some people have success with Autolite 104/103 and have had bad encounters with NGK6. Others, it's the vice versa.
Pick one and then I would suggest you the GP scanned for KR. Look at the results and go from there.
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DHP V1.0, Slotted rotors, S/S Brake Lines, Custom CAI, GMPP Handling Kit, KYB's, Jimmy C DP (U-Bend delete w/ Hi-flow cat), Flowmaster Super 40's, drilled 180° T-Stat, Alt. Rewire & Alt. Voltage Booster Combo, 605's, ZZP Motor Mounts
"The only difference between me and a madman is that I am NOT mad!" - Dali