It's probably not going to help much finding your car a few hours or days later. They generally make good use of their time after they steal a car.
You can use the mechanical fuel pump (and presumably carburetor) to your advantage. Put a solenoid in the fuel line before the pump. The car starts normally, but if the solenoid isn't activated the bowl isn't replenished. Thief gets maybe 100 meters and it sputters and dies.
Use something common like the radio controls, running lights, or the cigarette lighter to enable the fuel supply.