Why don't you try removing what's left of the broken shift lock so the shift release button works like it does on a pre-1991 car?

There's a yellow piece of plastic at the back of the shift lever. If you snap it out of there, the button on top is not interlocked. You can then move the lever as normally, and then your Neutral Safety Switch will work right.

Make sure the hook on the pie-shaped neutral switch is connected to the pin on the side of the shifter, so that it aligns correctly. There are two screws to allow adjustment of this switch but if you fix the other problem, that adjustment shouldn't be needed.

Good luck with it!

And what year is the car? 240 production ended in May of 1993.
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