I believe this body should have a fresh air vent on the passenger cowl for the 1959-and-later heater.

https://phoenix.craigslist.org/cph/cto/d/phoenix-1960-willys-jeep-cj3b/7214244810.html

“1960 CJ3b Willys Jeep
Starts and runs well. 4WD works as it should be. Hurricane F-Head engine. Comes with an extra set of tires w/rims (shown in pic), an extra rebuilt carburetor, and a new steering wheel.
Work done recently: New spark plugs, new battery, new mechanical fuel pump, fuel tank cleaned out, carburetor cleaned and tuned up.
Ready for test drive!
Asking $6,200 OBO
No low ballers please.”