EFI guys, any options for theft protection?

Ok now I get it. You switch the coil lead and a lead for a specific cylinder. Makes sense now.
A lot of the cars back then didn't have inside hood release. So it was an easy prank. And with carbureted engines, when that one cylinder fired, it was kind of like the engine may be flooded with gas so everyone usually just keeps on cranking hoping it will clear out and run.