interesting exhaust manifold design for heat dissipation, and I was reminded in the comments of the design's extra use, when a metal box was put over that, and one end of it fed the heat into a duct that went through the firewall, right were you see that access port beside the gas filter. I posted about those heaters years ago
https://www.mecum.com/lots/FL0120-396495/1931-ford-model-a-gulf-tanker/
The manifold is used to heat the interior of the Model A. There is a cover that goes over it that directs heat into hole in the firewall.
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