I suggest that you rig a hood lock and a kill switch. The easiest hood lock is a cable operated pin that interrupts the front latch. You can hide the lever somewhere in the interior. The easiest kill switches are a simple one that screws onto the positive battery terminal.
Of course if you put the battery in the trunk with a kill switch then that is a very effective deterrent to someone hot wiring the car.
Classic cars are frequently taken by a tow truck. I don't know about lo-jack but brickhouse dot com sells a cell phone unit that is the size of small brick and attaches to the underside of your car with a powerful magnet. It works on a 40 day battery, so you take it off and charge it once per month. The service starts at $15/ month, and works off a website and app on your phone. You set it up to notify you if the car leaves a certain radius, or obtains a certain speed. You can "ping" the unit at any time to locate the car. The service records the route that the car has taken, and the frequency of waypoints depends on the service level that you pay for. In theory, you would get a notice that your car is on the move, then call the cops and tell them where it is headed. Of course if the thief finds the box and tosses it, or takes the car in an enclosed trailer that interrupts the cell phone signal, then you're out of luck.
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