The seller says to call him from 9 AM to 11 PM (UTC-4) to talk about this Kellison J6 built over a 1958 Chevrolet Corvette chassis and engine.
Actually this Kellison body sould be the one called J6 “Panther” which was designed in order to be bolt onto the 1953 to 1962 Corvette chassis. with this body version, the roof was raised 2 1/2 inches for more headroom, the rear window was enlarged for better visibility and for the first time a trunk lid was added.
So, the lines of this Kellison are less extreme than the previous models but that mekes this car a more reliable vehicle. This particular car seems to be quite complete and indeed the seller says that most of the difficult work has been done (the car was once running), the only issue with this ad is the lack of photos, however this looks an interesting project at this given price. Find it for sale at $14,000 here in Atlanta (not sure of this), GA.