That's just that power rack by itself right? Any info on the steering pump/bracket weight for the power rack?
So using those numbers, if you assume the pump/brackets/junk weigh the same for each set up, that would mean the stock K, oe power steering set up would be ~50.2 lbs heavier than a HDK with a power rack. A stock K, power borgeson set up would only be ~35.1 lbs heavier than a HDK with a power rack.
And for those keeping track, that would mean the HDK K frame assembly by itself would weigh in at ~31.6 lbs, or only about 2.4 lbs lighter than a stock, 73-76 spool K frame.