There are lots of ways to earn safety exemptions from crash testing. One way is for low-volume production vehicles that will not result in mass-casualties thanks to limited production. You commonly see this with convertibles. But then you also have the other safety considerations such as DOT-approved external lighting. The biggest one of all are emissions requirements. Especially in the 80's when European vehicles were still cheating on power numbers by using leaded fuels (which everyone incorrectly blamed on Fuel Injection).
If you import a vehicle which is over 25 years old that was not originally intended for the U.S. market, you can be granted an exemption and they will allow the vehicle into the United States to be titled & operated on public roads.
But this Venturi? Nope. It's been hidden this whole time and never properly imported. That makes it illegal. Even if it WAS 25 years or older, which it isn't. Even if this car survived until it's 25th birthday, there is no guarantee that it still won't be seized by the Feds due to the illegal importation. Too much of a risk for any buyer.