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What are these firewall holes used for?

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I have a 1976 280z.  I am in the middle of a complete teardown and restomod.  I got the car as a shell.  I am wondering what these 2 holes are for in the firewall?




I believe the smaller hole above those 2 circled in red is for the hood release cable.


Also, what is this plugged hole that leads from the upper firewall behind the dash that goes into the inner cowl is for?





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The two in the first picture are both wiring harnesses. The big one is the engine harness from the ecu and the smaller one is the body harness for the wipers, engine bay light etc. 


I don't know about the one in the middle of the cowl, it's plugged in my 76 as well.

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