69PonyRider, if it won't start in Park you definitely have a neutral safety switch problem. Out of adjustment, broken wire, not working etc. It's located on the driver's side of the trans, the only wires on the trans go right to it, and that's where you'll be able to fix that.
As far as the other problem the list of what could be is very long but I'd be looking at that "kill switch" first. Mustangs didn't come with kill switches so somebody put it in there and quite often those kind of installations are the worst.
Hope ya figger it out!
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