GM never sold any 350 + manual trans cars to the public. there is however some documentation of 350 + 4spd test mules and GMPP used to have the parts to put muncie manual transmissions into thirdgens when they were the subject of an SCCA "spec" class briefly in the late 80's.
there have always been rumors of the phantom 350 + 5spd cars, but none have evr been documented or even mentioned by collectors or in any of the information GM has ever released.
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