Actually PSI on their instructions show where to drill the hole.
6.1 Mark the position where the wiring harness will come through the firewall with a metal punch.
(Typically near the passenger side cylinder head) Using a 2” hole saw, drill a hole in the firewall.
Make sure to debur the hole with a file.
That's where i drilled mine. Just about 1" outboard of where the head meets the block
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