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Don’t know what year K20 you’re dealing with, but if you have the original drum brakes some stock type 16” steelies have rivets that will slightly touch and warp those hard to find drums (I learned this the hard way). Full welded rim don’t seem to have that problem. If you’re running discs you should be fine
FWIW I think 235-85 16’s on those rims are the perfect look on a K truck.
Tom