I have a '79 Cali 930 motor, and I'm updating my ignition system. No complete history on the motor, stock 3DLZ turbo, stock fuel system & CIS.
Due to a cross country move and redoing my suspension, I don't have a lot of miles on the car, so I don't have any historical performance to base a plug choice on. The fuel mixture is a bit rich and I need to set timing as well, but the car starts and runs fine, no ignition related problems that I'm aware of. Parts replacement is driven by "while I'm there", clean baseline, etc.
I'm currently installing:
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Classic Retrofit CDI+
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Parts Klassik CDI Ignition Coil
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Magnecor Plug Wires
Since I'll be installing the plug wires, I figured now would be the time to install new plugs.
I've seen the NGK 2668 BKR8EIX IX Iridium's suggested on the forums before, but I've also found conflicting information about the "R" in the part number standing for resistor/resistive, and I'm not sure if that would be a bad thing with CDI. I'm aware of the CDI+'s reputation for having consistent/high power throughout the RPM range, not sure if that should factor in.
I also looked into getting the original spec Bosch W3DPO, but at $38 apiece from Pelican (as opposed to $10 apiece for the NGK's) I'd like to get more opinions before spending over $200 on plugs.
Application is spirited street driving and road trips. Little to no track.
Please let me know if any other info would be helpful for a recommendation. Thanks in advance.