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Does the engine have Delco EST ignition? What is the story on the engine,why are you trying to set/adjust the tming?
Does your timing light indicate that there is spark when you use the timing shunt?
What is the timing reading when you crank the engine over?
Hmmmm..... When you leave the shunt out, and start the engine, what does the timing read then? Is it 6 to 8 BTDC or so?
Is this engine EFI or carb? What is the model number on it? If it is EFI, are you shunting at the ignition module, or at the data link connector on the engine?
are you working on the engine now?
With EFI you would not shunt at the module, you would shunt at the data link connector. Do you see a datalink connector on the front of the engine anyplace? Maybe up front on the intake manifold?
Without a model number I just can't say. I will opt out and leave this open to the community. good luck