Engine Nitrous on stock fox body plugs and retard timing questions

[Foxstang31]

Recently bought a NX wet system for my 1990 mustang. Running a 140 fuel pump stock 19 injectors. I read that your supposed to pull timing 2* for every 50 shot of nitrous. Plan on running 150 shot so I would be pulling 6* right? Also what plugs and gap would you guys recommend for my setup?

 

[Foxstang31]

I have GT40P heads and I’m running autolite 103’s at the moment which is a 2 step colder plug already. Should I gap them at .35?

 

[Gear grabber]

If that head is typical 14mm .750 reach,gasket seat.
I would use a non-projected plug,like the NGK R5671A-8.
NGK plugs are very popular with nitrous guys because of the soft ground straps.
It will act like a fuse,if things go all bad.