Items I would suggest
Zex Kit- pretty much fool proof or
the old school NOS 5115 kit - if you go this route you'll need
window switch
Regardless of the kit i'd get
155 fuel pump
at least 1 step colder plug - asf32
Adjustable FPR
Optional but recommended
Fuel pressure gauge - I mount mine on the cowl not in the car
Bottle gauge
Bottle heater
Bottle Vent tube
remote bottle opener
purge solenoid kit and switch
Stock injectors will be fine as the N02 kit will increase the FP. Start off with the 75 shot and work your way up as you check plugs and learn how to tune it.
To do it right the cost is about a grand new. If you get used be prepared to at least get new solenoids.