The best solution for a street car is to find the main lead going into the ignition switch (white with black stripe, I think and depends on year too). If that lead is connected in series with your 'hidden' "KILL" switch the car cannot possibly start. Then again you will also remove power from other things. Get yourself a Helm to find the wiring you need to work with.
Another op[tion on cars with external coils is to put the switch in line with the 12 volt lead.
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