How critical is the position of the firewall aluminum? If I use the factory screw holes to align it tha panel it is off center and a lot closer to drivers side. Will this be important later when I am further into the assembly?
Not that critical, use the factory screw holes to start riveting it in place, just don't rivet it by the driver side yet, you'll need it to flex so that you can pull the wiring harness thru the hole (If you are using donor's wiring).
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