Those wheels only fit with an adapter or custom drilled rotors and drums. All GM trucks and SUV's from 99+ have six lug wheels, your 86 C-10 is a five lug design. Up until 98 GM really didn't run 16's in a five lug patterns, at least none that I can think of.
Your options are wheel spacer/adapters or custom drill your rotors or drums, or convert your truck with 88-98 six lug parts, like so...
http://67-72chevytrucks.com/vboard/s...d.php?t=447061
Now if you don't want a lift you don't have to use the lift spindles, just stock spindles from a 88-98 light duty 2500
EDIT: Tahoe limited wheels were 16x7's in a 5x5, but JL finding some