I wish you luck, CG. I've had the same shell for about 20 years and haven't done anything with it.
I was doing other things in the early 60s, "seeing the world", so people active in slot-cars then may correct me, but I believe the Super Shells bodies were mostly used on scratchbuilt chassis, often with a K's Mk I motor, a slim open-frame.
The shells were apparently sold with wheels, axles and a plastic chassis purely for static use.
Super Shells did produce an F1 chassis kit in nylon for slot-cars, called Slim Jim, but I'd be pleasantly surprised if many survive.
I have a few Super Shells leaflets and the image below should show (1) the blurb for that chassis kit and (2) a section of an earlier general leaflet on the various shells showing how a chassis-motor unit could be built.
Another chassis built for Super Shells bodies and K's Mk I motors was called Power+Plus. I have the leaflet but it doesn't say who produced it.
You may produce a quite authentic build if you put together something with a K's and an early Airfix front axle unit, or another old open-frame motor low enough to fit. The slightly later Airfix Slimline motor would work too.
Rob J