[YENKO DEUCE REGISTRY]

The F41 option in '70 gave the Nova a rear sway bar setup, and according to the option list was only available when the SS option was also ordered. I believe the SS option required power front disc brakes, so in theory you could have an SS without F41, but not an F41 without the SS - disc brakes (unless it was a COPO Nova). Look under the rear of the car, above the muffler, to see if the factory floor braces are welded into the floor/frame rails. The rear bars can be added, but they rarely have the original floor braces installed - they usually attach the 'hanger' bars to the frame rails instead.