JJ86!
i´m going to run nitrous too,and i bought the TR6 plugs one heat range colder,and are too cheap :D :D
do you have pictures of your nitrous setup,cause i dont know exactly where to place it the nozzle for the hose form!! :confused:
I ran a 150 shot on my L98 for years with the "stock" heat range plugs with no problems. There is alot to be said for tuning. I would retard the timing a bit to be on the safe side.