zkiller

I am looking to find out what spark plug to run in my 91 LX 5.0 liter.
I am adding nitrous and need to go one heat range colder than the stock plugs.
Anyone know the autolite part number for that plug?

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KB 2.4, KB Stage2, Level 10 , SCT, Brenspeed, 6-point rollbar, Simpson harness, GMS COPs, ST Motorports Ice box, AFCO HE, Powerhouse
11.42 & 118.92 MPH 1.63 60'

ANTI-CREW CREW
"OLD SCHOOL"