84' Cutlass pro touring build

Decent, I found the spare ferrule thingy...
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So here i am knee deep.... I am going to get a 2 inch hole using an electrical knockout slug tool behind the intake manifold for wiring harness. Seriously considering removing all the factory insulation and going aftermarket for heat and sound insulation on the firewall. If you were in my position what would you use? I'm not opposed to spending some money here but the choices are so vast it's confusing 😕
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