Since you guys seem to know what belongs and what does the stuff on there belong too? is that a 273 340 air cleaner?
is it supposed to be the black one? /and what about the valve covers and hub caps?
It`s hard to say where the parts on the car came from, especially after 42 years. The valve covers look like DC covers from the 70`s, the originals would have been chrome plated but would have only had one opening per side and wire connection looms/retainers. The air cleaner looks like a chrome reproduction of the 68-69 340 to 440 air cleaner. The original would`ve been about 2 inches larger in diameter and a bit taller with a a small flattened area on the top side. The hubcaps look like 65 or 66 C-body caps but I`m not quite sure. If the car is a rust free 67 Formula-S car with it`s factory big block then small things like that can be overlooked. Although original valve covers and air cleaners for these cars are rare and expensive they are available from time to time. I think the car is marketed at a fair price for what it is. Good luck to the seller, perhaps somebody here at the site will buy it.