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There appears to be a patch panel on the firewall where an airconditioning plenum may have been.
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Verne,
It does look like a panel in the pics, but it is just an optical illusion. The original firewall with factory dimples are reflecting light.
The car is a Black Coupe with a Red and White Hounds Tooth interior a Cast Iron T-10 4 speed and a posi rear.
The car came out of the Tom Deitz collection.
Thanks for sharing your knowledge