It has an aftermarket 3B tub on a custom frame.

“Willys 3B Jeep with a custom boxed frame. The jeep has a hard top with the hard doors. There is a Chevy 350 mounted on the new custom frame as well. The tub is the remanufactured heavy duty metal tub. New hood, fenders, nice grill, tailgate, custom steel bumpers with heavy duty tongue. This is an unbelievable project, it just needs someone to finish it up. New disk brakes, hubs have been rebuilt, fluids changed in the axles. The pictures in this ad were taken prior to having a custom boxed steel frame made to handle the 350 engine. Too many new parts to mention!!!!! Make me a reasonable offer! Will consider trades such as equipment, tools, tractors, lulls, skid steer, trucks, diesels, trailers, lumber, center console boats, inboard boats. I am open to trade up with cash.”

https://augusta.craigslist.org/bar/d/willys-3b-jeep-custom-boxed/6389771979.html