You can go Procomp 2.4 lift but when your rear springs start to settle or if you haul things then the rear will start to lower.
I'd recommend 2"-2.25" if you plan to leave your rear stock.
Try and stay away from the rubber/plastic, or aluminum spacer blocks. Rubber/plastic will degrade, and aluminum will corrode over time. Try and find a good set of steel Powdercoated "set on top" coil spacers. (Do not get the one's that install in the strut) they tend to cause strut failure, and a hash ride. This is because the increase the coil length and over extend the strut. (ontop spacers will keep your truck as close to stock ride as possible.)
(If you have a 4x4 you might want to look into suspension limiting straps (If you plan to huck your truck))
Also by staying bellow 3" lift on the front you'll be able to have your alignment in a better psoition. Set your Camber to 0* and your Caster in the middle of the factory spec range. (Increase the caster accordingly as your tire size increases to maintain stability)
If you want to run 35" tires I'd consider a 4"-5" DB lift in the long run it will save you a lot of heart ache. But that's a different topic.
Good luck!
