Just my input.....
I have ran many hundreds of bottles of nitrous through my cars over the years. The only parts damage that has been a problem are the parts that would have been a problem without the nitrous. I run a 90 vette 6 speed car now with tpi /350. runs 11.50's all day on the bottle and 12.90's off. I have a NOS plate with the 150 shot jets. I dont retard the timing and am running off the fuel rail with a regulator for my solenoid. Works perfect and the 150 hp kit is making more like 200 plus. watch the header gaskets. They tend to go away with spray