I know a guy who put razor blades inside the dash around the stereo after the previous ones were stolen. Lots of blood and no charges... be nasty if you were to have a heart attack or whatnot and keel over, then some poor soul (or your dad) starts parting out your car legally.
Now a stun gun, that's got potential.... thousands of volts of potential.
I would stick with less aggressive measures though. Removing the distributor HV line is possible, but not only is this a real pain, it's totally obvious to fix. Everybody I heard of doing this puts a switch in line with the fuel pump power. If you do not know where the switch is, you may not be able to find it or jump power around it.
The car may not start or may run for only a block until the carbs run dry. Leaving the car in the middle of the street sounds dangerous, but no thief is going to stick around to fix it. They've taken the car out of the safe hiding place of a garage or parking space, and after that, the cover's gone and it's time to run. Or if it doesn't start, they may assume the car was busted before they got there.
I think a fuel injected system won't start since there's little or no residual high pressure in the rails to power the injectors. Carbs have float bowls full of a small amount of fuel, but don't need it under pressure, so it will probably start.