Because this is Minnesota, there's rust. You betcha there's rust! A resourceful owner used what appears to be aluminum siding sliced from an RV to patch some of the worst spots around the rear wheelwells.
Under the hood, one of the all-time great Detroit (well, OK, Kenosha) engines: the American Motors straight-six. If this is the original engine— never a sure bet with a truck, but I didn't check casting numbers— it's a 4.0 aka 242. Sure, this early-1960s design was old-fashioned, but that didn't stop Chrysler from making it until nearly the current decade, and it's a good bet that someone in China is making them right now.