Would like some perspective on fox 2.5 race series

So I have an opportunity to buy some second hand but unused fox coil overs and matching rear shocks. The coil overs are the fox race series 2.5 Reservoir

$1,758 880-02-376 Rear Coilover Shock Absorbers Fits Toyota Tacoma

880-02-376. I cannot find any info on spring weight 600lb, 650lb? I am guessing they are adjustable without changing a clip position while on the truck using the rings to adjust for height or any taco lean issues (would I want a spacer to have the preload matched?) the rear shocks are the remote reservoir 2.5s 883-24-007. I would need to buy leaf springs obviously to do the lift probably Deavers, or OME heavy rear leafs. I have about 300lbs constant weight with ARE cap, misc stuff in my locking bin in the bed. This is a pretty limited time deal cause the guy is moving. He lifted his taco with another set of fox with custom valving or something and never installed this stuff. Nice looking rig btw. Would I need UCAs sticking with this setup and probably a 2” lift all around? Any info or feedback on this setup would be appreciated. Price would be pretty fair. I bought a TRD skid plate from the guy a month or so ago for a fair price, he went with heavy duty steel skids.