I can explain the exhaust.
In the late 70's Iowa passed a vehicle inspection law that was VERY poorly written.
The law stated the exhaust must exit behind the rear of the car. Many cars required "exhaust work" of some sort to pass the initial inspection to be registered (depending on the inspector that often owned an exhaust shop).
This laws was really tough on Chevy trucks and station wagons.
Vehicle inspection only lasted a few years in Iowa, everyone hated it. We never got it back
That exhaust looks like the kind of stuff done to get cars to pass inspection.