This is a cool truck whomever owns it. It’s for sale here in GA he wants a stack of cash for it but still awesome figure I’d share.
I have a 331 Chrysler Firepower medium duty truck engine in my rat truck. No name valve covers is what they came with. I've seen them on 345s but not on 392s.Lack of Chrysler Firepower on the valve covers is a dead giveaway. Probably Desoto. Dodge would have Red Ram on them. Desoto had their call out on the wire covers. Firedome Eight.
The concern to me is the heads are totally FLAT in the front. Normally, the 392 has the water cross over between the heads. Could be a case like mine though and have the medium truck/industrial heads without the cross over. The general shape and size of the valve covers looks right for the 331/354/392 engines.