Drives when in Neutral. B&M shifter

Recently purchased Barracuda with 727 from TCI. The prior owner never installed a lockdown cable. I've installed a kickdown cable and changed the fluids. 1st, 2nd and D work good. It will also move in Neutral.

To further complicate the issue, the car has a B&M gate style shifter. If I lift up the reverse lockout. I can find a resting area in the shifter that the car doesn't drive in N. The instructions are simple. Shift trans into low. Adjust cable for the low gear. Are these shifters just needing to be better adjusted? I'm guessing the prior owner wasn't a expert on transmissions; based on the lack of lockdown lever/cable.
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B&M Magnum Grip Pro Stick Shifter 81040

These aftermarket shifters can be a bit picky about the adjustment.
I adjust mine in neutral to have it come out perfect.

If you do adjust in neutral and it won't go all the way one way or the other in it's travel you need a different lever on the trans that has the right geometry.
Some levers can be redrilled or even slotted to get it nice.