Anti-seize is for threaded fasteners that get tightened,
then stay put for months/years/decades.
Brake adjusters move every time the brakes adjust. Anti-seize is not appropriate.
The '97 C/K service manual, page 5C1-4 suggests GM 5450032 "Brake Lubricant" "or equivalent" for adjuster threads on Leading/Trailing Shoe brakes. That part number goes back
decades; the older containers show that it was made by Lubri-Plate, makers of the famous "105 Motor Assembly Grease" (i.e., NLGI #0 (very thin) calcium-based white grease.)
Photos shamelessly stolen from eBay.
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Note that in this photo, they've also printed "No. 110-D". Lubriplate 110 is an NLGI #2.5 (semi-stiff) white grease with calcium thickener. I'll assume the "-D" signifies that it's custom-labeled for Delco.
www.lubriplate.com
"LUBRIPLATE No. 110 is recognized as an outstanding brake lubricant."
Wild Guess with some evidence: #105 and #110 is the SAME STUFF, except the 105 has more "solvent" to make it "thinner". #105 is advertised as "...excellent rust preventive greases."
www.lubriplate.com
5450032 also crosses to ACDelco 179-400. The product must be discontinued--I can't find any current listings under either number.
That same service manual page suggests "Lubricate the shoe pads on the backing plate with a thin coat of white lithium grease."
OTOH, the '97 C/K service manual specifies on page 5C2-3 "Lubricate shoe pads and adjusting screw threads with a thin coat of white lithium grease or equivalent" for Duo-Servo drums.