Stock ignition + Nitrous ??

Oh yeah...I forgot about that #2 cylinder you were having problems with. Have you figured out why that #2 cylinder keeps fouling? Maybe you could just keep that one cylinder's gap a little lower...like .040-.045. I really don't have much experience with the whole fouling plugs thing. The fouling I'm sure is linked to the wear & tear on your high mileage motor. Someone else is going to have to chime in here. If I were you, I'd call the N.O.S. techline & explain your problem. They'll probably tell you not to juice a motor with a plug that fouls though. Good luck. Sorry I couldn't be of more help.