i had the zex kit on my t/a then put it on my rustang. i had very good luck with it, just if you have an auto get a window switch, bottle heaters are almost a must with any dry kit, platnum/iridium plugs are a no-no, and don't use a fuel pressure safety switch(or non-safety switch as i like to call them)
read the manufacturer's instruction's, they're the ones who designed the kit. If it was made to release a 100 shot on a stock 5.0, you should be fine. A larger fuel pump may add piece of mind. Have fun with it!!
You don't NEED a 255lph fuel pump for a basic nitrous kit. If the stock pump is okay, you could get away with it. I prefer not to take chances and installed a 190lph pump, and haven't had an issue after three tanks have been put through my engine; the last tank I was spraying 125.
As far as "nitrous oxide" meaning "NOS", everyone calls it NOS now, oh well.