alright here is an education...
If your wanting to install air ride in place of the springs then that is NOT the kit for you. If your wanting to do it the simple way then you will need to fabricate upper and lower cupps for the bags to mount to. And these will bolt into the spring pocket. Doing it this way will get you at the most a 7" drop aired out. and you will not have a low ride height. its gonna be like closer to a 4" drop at ride height. Now if your wanting to tuck tire, lay frame and go all out, (like I am) you will need new rear links (either 2,3,4 or ,6 wishbone triangulated, parallel) a step notch, cut out the floor, & new wheel tubs. Now if your doing all this work to the back; the front is gonna need the UCA's moved up 1.5"s, new lower control arms flipped uppers and welded on bag mounts.
Now on the valve set-ups I always always run 8, Not for the fact of FBSS but its to isolate any air transfer that might happen if you run only 4 valves, air transfer=more body roll. at the minimum you could do 6 valves to save a few bucks but what is $60.00 more if your already spending thousands for a air ride set-up??
Like stated before an EDC is a engine driven compressor they are fast for filling big tanks or multiple tanks, but the kits are expensive, I mean the complete bolt on EDC's I sell are like 1k but they come with absolutely everything to mount it on your engine. But as far as compressors I would do a minimum of 2 Viair 380's @200psi on a 5 gallon tank. Oh and I do sell and install air so if needed I can sell you whatca need. LMK if you got anymore questions