With forged internals your safe to around 250 shot, just make sure you pull timing out accordingly.
Rule of thumb 2/3 degrees for every 50 hp of nitrous.
The MSD digital 6al has a built in single step retard you can use just for nitrous.
Slap a 150 plate on it, program the single step retard (6 degrees) to be ativated with the nitrous on and your good to go.
Goodluck, Cp