I know the early g-bodies were available with a manual transmission at least up to '81 (my old '81 Cutlass could have been ordered with a three speed manual trans). I have seen a few manual trans g-bodies floating around on ebay so they are out there. With the popularity of these cars and the desire to have something other than an automatic in them, some aftermarket restoration parts places have made available almost every part you would need to convert over to a manual trans. Look around and you can find it.
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