The first thread I found on this subject was from Hilandr451, for his totally awesome project on his '66 C20:
http://www.67-72chevytrucks.com/vboa...d.php?t=357610
He upgraded to power steering, which I decided to forgo, based on the expected cost (and I'm scared to death to cut my steering shaft!). I would reconsider this if power steering proves easier and cheaper. But in an effort to find a way to save my original steering, and figure out all the "gotcha's" concerning a C20 disc swap as opposed to a C10, I read through all 21 pages of this current thread looking for every reference to a C20. The list below includes every such post I found:
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36-39, 48-50, 55-56, 89-90, 155-160!!!, 165-171, 189!, 216-(217!)-219, 293, 336-337, 378, 384-385, 515!-516!, 519!-520!