Hotchkins has figured out how to make these pigs handle pretty will. I would go with the McGaughy spindle and Hotchkins springs in rear. I would also add the Hotchkins sway bars!. If you are towning or hauling anything you are going to be banging your axle on the frame with a 4 inch rear drop. A set of Air Helper springs is the only remedy, besides a c-notch.

The spindles up front will give you the best over all ride quality and front end suspension and steering geometry.

 

The Hotchkis springs up front rode too stiff for me, DJM lca's ride much better. I loved the way the Hotchkis leaves kept the rearend planted over bumps. It didn't jump to the side like the factory leaves make it do.

 

I say DJM with LCA. Better ride and alinement.
Do a search, you will find lots of info on this subject.