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Not specific to that vehicle, but I think that generally, the way type certification works for vehicles is that existing certifications remain valid for already-manufactured vehicles, but once regulations change, you can't just go back and produce more of something.
I am confident that doing the Willys in particular would violate existing regulations. One off-the-cuff issue is that the original engine in that thing would have used leaded gasoline, and I'm pretty sure that you can't make new cars that use leaded gasoline in the US.
EDIT: It might be possible to build an "experimental' car for yourself
I forget the term, but there's some class of vehicles in the US that DIYers and experimenters build, and I believe that it has a lighter set of requirements. Even if you could, though, it wouldn't permit for mass production, which I assume is what you're after.
kagis
Sounds like at least some, if not all, of that classification is state-level. So I suspect what's permissible would vary by state.
https://afdc.energy.gov/laws/9492
https://www.dmv.ca.gov/portal/vehicle-registration/new-registration/register-a-specially-constructed-or-modified-vehicle/
My brother built his own car, someone from the state had to come out, certify it, and put the VIN stamp on it. Had to have a roll bar, seat belts, and pass modern emissions standards.
For a Willy's jeep, the best thing you could do is find a roached out one and build it up from scratch. Like a firearm, there are just some key components that have to remain original. The frame and VIN might be all you actually need, and since it's vintage, you'd only have to pass the safety and emissions standards of that era.
You just have to adjust the engine to run unleaded, should be an easy fix.