XJ lift
 

First post, so I hope it's in the right place. My problem/question is...I have a 94 XJ I bought a couple months ago. It currently has 1.5 inch lift block in the back and aftermarket coil springs in the front (I'm assuming they're also 1.5 inch longer). My question is if I want to get a total of 3 inch lift should I go with 1.5 inch spring spacer in front? And in the back, should I remove the 1.5 inch block and stock 3 inch shackles and just use 6 inch shackle? (I already have a set of 6 inch shackles I was given). It also has Rough Country shocks, which I will change out later if that's advisable (I've heard negative stuff about RC). Any and all advice is appreciated!
Other info....
Dana 30 in front
Chrysler 8.25 in rear
31×10.50s.
Not other suspension mods.

I wouldn't use any more than a 2" lift shackle, I didn't even think they made 6" ones that would be dangerous. Coil spacers in the front are fine up to 2-3".

i would seriously look into replacing the leaf packs in the rear in combination with a 2 inch lift shackle to get you your desired lift height. (remember, a 2 inch lift shackle with be 4 inches eye to eye) so a 6 inch lift shackle will need to be 12 inches eye to eye. that's waaay too much shackle.

new leaf packs should be around 150 per side. much safer than blocks or shackle lifts. and stay far away from novelty shackles, ie, teraflex extendable shackles. even though i've used them with no ill effects, they still are not as stable as solid aftermarket shackles.

Thanks. Should have been more specific. The rear shackles are 6 inch total...3 inch more than the stock ones i would be replacing!