I'm curious of your motivation for settling upon 8" of lift? Are you copying the look of another truck you saw a photo of? Are you trying to clear a certain size tire?
Different ways to skin a cat for those 8 inches -
I lifted my truck a total of 8" as well, but 6" is pure suspension with no spacers whatsoever and the other 2" are there because my new tires are 2" bigger in RADIUS.
As someone stated above, look into how your objectives will impact your truck as a whole - how will that much lift begin stressing other components prematurely.
I have a 4-5" suspension lift on another truck I own. And to go up ONE more inch could cost me thousands of dollars. WHY? Because that extra inch will OPEN a HUGE can of worms - I'll need all sorts of extra parts to ensure I do NOT stress out my drive train etc. Double cardan drive shafts and such.
When I was younger, I focused more on that magic number - height. Now, with the investment in my trucks and being a bit more sage, I focus far, far more on suspension geometry, performance, reliability and though my trucks are larger, they are sufficiently stuffed so they come off pretty balanced looking. Something I strive for - a lifted, beefy, performance minded truck that looks like a stock truck on steroids VS the monster truck look
It's great to see you inquiring here, looking for input so you manage your objectives while sidestepping known pitfalls along the way.
I'm looking forward to seeing what you create man!