Help the new guy drop his chevelle

[cobra2547]

OK so I would like to drop my chevelle but don't know all the parts I need to complete this.I am more of a late model mustang guy. This is what I have 71 chevelle 454 power disc brakes front drum rear recently installed. 12 bolt rear with stock control arms and ladder bar I plan on putting a set of aftermarket arms and removing the ladder bars. Here is a current picture of my car.

This is what I want in terms of ride height

so what is the shopping list going to consist of. What do I defineately need and what are some nice option that are not really needed.
Thanks