Pull the center distributor wire for the coil and disconnect the ballast resistor wire so it won't start in case they try to steal it...
When we were doing the design verification test road trips in El Paso, TX, the mechanics would disable the ignitions in the Jeeps so they couldn't steal them... If they got stolen and brought into Mexico it would take more money to get them back over the border than we had invested in the cars... That's with many prototype parts that cost more money than production parts to prove out the design... So our mechanics on the trip would disable the cars so they wouldn't start while we stayed overnight in the hotel...