rule of thumb is two degrees for every 50 shot of nitrous, but your v8 should have enough fuel to support a 50 or 60 shot without the wet system, but a wet system is always a good thing to have. your stock plugs should be fine as long as they're not platinum, i ran a 225 shot on my integra. i ran ngk power -7 ,but go to a speed shop tell them what your running and ask what plug they think you should run, just run a one step coulder plug if needed