Thanks Tim. I deleted and reposted a better picture of the firewall in the original post. I don't know why it's posting here upside down though...

I'm guessing picture 2 and 3 are a fresh air heater? And picture 4 some kind of aftermarket fan?


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)