The difference between the front and rear of these trucks usually runs about 2.5-3" and you will only actually see 1.5-1.75" of actual drop out of the shackles. So if your front is stock, there is no chance that the shackles will cause it to sit nose-high or "uphill". The shackles will get the truck close to level by eyeball but you will still actually have a little bit of front rake, especially by measure.
My truck was leveled entirely by raising the front with the torsion bars originally. Then I installed the shackles and lowered the front down to make it level. Even so, based on measurements and visual comparison to trucks like mine, my front end is still sitting about .5-.75" higher than stock. Even so, it has never looked nose-high, even with a couple hundred pounds in the bed. Hope this helps. Let me know if you need anything else!
Also, FYI...this is the exact guy I bought my shackles from. He was the best price shipped and had them in stock for immediate shipping. As you see, he has 100% positive feedback. Communication was great and they were at my door in a couple days.