crack kills..........I dont see it being of much advantage on a n/a motor. I think there was a thread where a guy was trying it on a built hemi and the n/a results werent very spectacular.
Talking from expierience, I'm runnin' a 351 with Edlebrock performer heads and a s/c with meth. ONE nozzle is enough, I had two and melted a piston. But, I don't know the answer to your actual question, i've only had it on my supercharged car.