I keep looking at this thread and I have decided I have to reply.
Looking at the picture, it looks to me like the shock will bottom out if the vehicle hits a small pothole or enters a driveway too fast.
Shocks that "bottom out" (or "top out") will be damaged sooner or later (or maybe the suspension will be damaged).
If these shocks can bottom out; then, I think these shock absorbers should be removed and set aside until you do the 4" lift. Put the old shocks back on or get a new set that "matches" your current suspension travel.
Shock absorbers are "matched" to the suspension that the shock absorber is used on -- for stock vehicles, "everybody" knows the correct lengths.
The shock should "ride" / "work" in the middle of its "travel range" ("middle" of fully compressed to fully extended) with 1 - 2 inches (I do not know the exact figure.) of "left over travel" at either end of the travel.
Fully compressed, shock should measure 1 - 2" less ("eye" to "eye") than the the measurement of your suspension fully compressed (top shock mount to lower shock mount). Same for "fully extended".
Jeff will have more knowledge than I on the shock lengths versus the different lifts / suspension modifications -- and why he asked "how" the shocks were going to be "used" in the first place.