What is needed after 4" drop?

[Kracin]

ok, so ive been searching but i keep coming up with maybes, yes and nos, and youll need this and that, and some saying that you dont. but if i were to go with a 4/6 drop, what all am i going to need to install? from what i saw, with drum brakes on the truck, id need a c notch in the rear, and new drop shocks for the front and rear... but i also dont know what size the shocks have to be to fit a drop like that. any help would be appreciated