I did the same thing on my '67...everything was missing or broken. I may be wrong, but if you cover those holes, it may get real warm inside the car. One of those is an inlet for fresh air. (Through the fender) I was thinking I'd just leave all the hardware under there as it is, so I can control the heat and fresh air flow, including the A/C blower. Maybe someone who knows more about this can help us both out.
I had a 70ss 454 (Ls-6)I did the same thing. But when I cut a big hole in the trunk for the fuel cell I used the trunk metal to cover the hole in the fire wall. I'm kidding guys!! Actually I've seen the use of a heat only section, from a donor welded inplace of the A/C and looks clean, or you can cover it with metal the race way.
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