Through firewall on 69 Chevelle with AC?

[Barrrf]

HEy guys, currently rewiring my 69 Chevelle with the AAW kit. As part of that job, Im also going to clean up the Terminator X wiring harness. Its currently going in through the firewall low on the passenger side, like right where the passengers feet can kick it. It's the only place I can find that isnt covered up on the inside by the AC ducting and box.

I wanted to go in through the firewall right behind the intake almost dead center. But looking up on the inside and theres a big plastic box there (duct work I assume).



Does anyone have a good option here? Ive considered that possibly replacing the factory AC stuff with a Vintage Air system might remove some of the bulky stuff?

Completely open to ideas here.