A 'colder' plug should be shorter than a 'hotter' one.
For example, I use Autolite #3924's in my Mustang. For you, with nitrous, you'll probably want to use a #3923 - or a colder plug.
Hope this helps.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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