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So, for the majority of my petrol-head forming years, my (old school) father was of the opinion that Champions were crap and that NGKs were the best... (I think that at some point a bad/worn/burned old Champion must have screwed him over on the side of the road one night and he just simply never recovered from it...) 
Consequently, I have a good feel now for the temperature-ranges of NGKs. I don't though for the others such as Bosch, Denso, Autolite etc...
Any way, I think that the stock 24 valve cars call for an NGK R (somewhere LOW down - like a 6...) Cross-referencing that with an Autolite (that I have been using in the 164 LS/Qs with good success), I see that their temp ranges go hotter as their numbering goes up - 1 is cold and 3 is hot and then that's it...!? 
Also, the 24 valve has this funky small wrench-head on it too and not any plug-socket can fit in the hole (no room for a plug-wrench to fit around it - so there are several variables here!) Any way, I was running the Autolite Double Platinums in the 3.7 race car (and that plug is already at - what they would consider - the cold end of their range!)
I was getting the 3K stumble that feels like spark-scatter and we think that the smaller plug-gaps will take care of this, but Dawie wants me to run an 8 (on an NGK scale) at a minimum and preferably a 9! Can't find any here! He also mentioned a c63c Champion, but I think that it plays out to be an 8 on the NKG scale!
Can somebody please suggest a 9 that would fit?
Consequently, I have a good feel now for the temperature-ranges of NGKs. I don't though for the others such as Bosch, Denso, Autolite etc...
Also, the 24 valve has this funky small wrench-head on it too and not any plug-socket can fit in the hole (no room for a plug-wrench to fit around it - so there are several variables here!) Any way, I was running the Autolite Double Platinums in the 3.7 race car (and that plug is already at - what they would consider - the cold end of their range!)
I was getting the 3K stumble that feels like spark-scatter and we think that the smaller plug-gaps will take care of this, but Dawie wants me to run an 8 (on an NGK scale) at a minimum and preferably a 9! Can't find any here! He also mentioned a c63c Champion, but I think that it plays out to be an 8 on the NKG scale!
Can somebody please suggest a 9 that would fit?