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You’ll need to cut an oval passage in the firewall as shown to allow for the main EFI wiring harness. Here the main plug for the ECM goes through the cowl.
5.0L Engine & AOD Transmission Swap

 You’ll need to cut an oval passage in the firewall as shown to allow for the main EFI wiring harness. Here the main plug for the ECM goes through the cowl.  View Related Article