[Stocker]

Very nice looking truck, congratulations! Can't give a definite answer but I'll mention this: when I replaced the sagging front springs on my K20, I measured 7/8" to the bump stops, and it was bottoming out easily. The new 2.5" springs resulted in a 3.75" gap.

Subtract 2.5" (my lift springs) from 3.75" (gap) gives 1.25", or what the nominal gap might be for stock springs in good condition. Maybe you don't have much sag after all.