Hard to clearly understand your question...
If you are asking if the heavy, taller 863's will work on your rig, as to not sag as much in the rear when loaded up, towing etc...then the answer is yes. They are stiff when unloaded but nice when loaded, some love it, some hate it
Concerning stock shocks, I wouldn't use them personally. If I recall correctly the tall springs, 863, will be suited for a longer travel shock than stock. They might be om with 863's and stock shocks but I believe you will limit the amount of travel by doing so.
My rig is a pig, I have an OME 2.5" lift kit with OME Nitrocharger sport shocks F/R w/ a 30mm spacer in the rears, 863 springs. works very well together....tho I'd like to go to 864's, taller spring