I'm presuming there is still a spark distributor and a single coil? Interrupt the electrical power on the primary (low voltage) side of the central coil.
Individual coils? Sorry, can't help.
Cutting the electrical power to the high pressure fuel pump may not reduce the pressure enough to assure engine rotation cessation. Many cars have two pumps. The low pressure pump to keep the main one from cavitating may just be enough to keep the TBI functional.
If there is a separate fuel shut off solenoid, then cutting the power to that electrically operated valve will immediately starve the engine.
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