I had a friend who had similar issues. When restoring my 67 I found that the adjustment for getting "Park" or getting "Low" is very problematic. You either get one or the other. The difference can be literally about 1/4 to 1/8 inch of travel in the cable.
In the assembly manual PAGE 361 it shows two things I found important. First there are washers (more like spacers , see photo)) at each mounting hole on the bracket. Second, the bracket itself has adjusting screws in each side (see photo).
By adjusting the bracket up or down it changes the cable travel just a little bit and Ii am able to get both Park and Low. I also think that I have an original 67 cable, so that may be critical as well.
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