How many miles are on it? I'd replace the chain if its got over a 100K on it, just to be safe. Usually the kits come with everything you need. Stock fuel pump and injectors will be fine too for 5 or 6psi. Make sure you have good oil pressure, if you get a supercharger what pumps oil from the pan to the unit.( vortech does)
www.vortechsuperchargers.com Go there you can even Download the parts list for kits and Installation Manual.
So you should'nt need anything extra.