Really need to find part numbers for the RC 4in and RC 6in. Ill look when I have some time.
Can't tell if you have rear lower control arm drop brackets in those pics but I assume you do. You definitely have the panhard drop bracket.
Just my preliminary inspection...
You will need to remove the front dif drop and possibly the front drive shaft spacer. And remove the front lower control arm drop bracket/cross member. Remove the rear panhard bar relocation bracket, and remove the rear lower control arm relocation bracket. Need new struts and rear springs as there are no spacers to remove.
I think the best way to go about this would be to get an Eibach pro lift/level kit. The Eibach comes with rear springs that are +3" I think, and the front struts are adjustable to over 3" taller than stock. It's a good thing you don't have geometry correcting front upper control arms. Typically a 4in kit with geo correcting uppers leave the upper control arms at a funky angle. But, you might want to consider some Zone upper front control arms too with the Eibach kit. As to get to ALMOST 4in over stock, you're going to have to crank the preload all the way up on the front struts.
EDIT:
Looks like you might need some new rear swaybar endlinks too. Those don't appear to be stock but, may still work lowering it a bit though.
Maybe a full new 4in kit might make this easier. But, will have to do some research.
I have no idea what to do about the 6in knuckles though. If you go with the Eibach setup I am talking about, you'll need stock knuckles.