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I worked as a Nissan Partsman from the Mid 70 through the early 1990's. Datsun/Nissan had TSB's ( in Canada at least ) to always use the Projected tip plugs in place of the non projected tip. Places the spark kernel in a better position to promote flame propagation and also the projected style resists fouling better. As mentioned, BPR6ES-11 is what you want. You could also use their V-Power series. BPR6EY-11 The NGK NE61 plug wires are very high quality. Plus they smell like Bubble Gum...Yum!!

I haven't heard of John Williams before, I am new to the Z community, but I am very sad to read about his death...seen Blue's link I understand he was indeed very important to the Z's world... he was really young... many people die around us... we make the mistake to take life for granted my thoughts to his family...

http://grassrootsmotorsports.com/forum/grm/rip-z-car-expert-and-racer-john-williams/96632/page1/

The tail lights arrived today. They are nicely made, look like they will hold up well, and the chrome strip is excellent. They will be a great replacement for the 43 year old originals. Good vendor, good communication, fast shipping, good price, quality product......in case anyone else is looking to replace their lights. Dennis

You'll probably want to gap the plugs wider to take advantage of the high energy ignition module. So the -11 is the way to go since it's prebent to .040" gap. P is for projected tip and it's not really clear why Nissan jumped around on that specification. People have their theories but the shape of the combustion chamber is probably what matters most. Can't really go wrong using the factory spec. If your engine used a P tip, use a P tip. New wires are a good idea since you'll have more voltage with the wider plug gap. It's the -11 that's probably giving you problems on the fitment. -11 is prebent for the .040" gap. These would not work with points well but you don't have points any more. I'd use the BPR6ES-11.

Watanabe RS in 15x8, 0 offset. Tires are 225/50/15 Toyo RA1's all around. Rolled fender lips and GC Coilovers for clearance, no spacers.