you say the regular shifter works but not the dual gate...but then are saying you put a TH350 in.
was the car originally a 2 speed? if you did nothing but change to the 3 speed, then the original 2 speed shifter wouldn't come back far enough to put the transmission in low (it would only come back to 2nd gear). The 3 speed shifter dual gate or not would have a longer throw on it between Park and 1st gear. so a two speed cable won't work on a 3 speed tranny (unless you don't care about getting into low as it will handle park through 2nd just fine with some misalignment of the shift indicator)
So, as I'm guessing you're going from a two speed tranny/shifter to a 3 speed tranny/dual gate shifter, you need a 3 speed cable.
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