measuring for new shocks

[wforicv]

I have to get some new shocks on the back of my K5. I will be finally getting around to tossing the 4" blocks (yuck) out and installing the 4" shackle flip I have (ORD). I want to go for an inboard setup through the bed. Now for the newbie question: "What is the proper method for measuring for the right length of shock?" Do I just flex it with my shocks off and measure droop? Also, what about the bumpstops? Do I space them down to hit just before the shock fully compresses? I want to get a good set of shocks, any suggestions?

Thanks for the help

Eric