The Strombecker Lotus 29 had three different motorizations.
The slot car kit first received the standard Igarashi "9091" found in all the 1/32 cars from 1963 through 1965. then by mid-1965, the Scuttler.
The RTR version may also have received both, hard to tell until inspecting one still sealed in its box.
But the cutout sides seen on the later Scuttler version are for the "pylon" version which received the same type of Mabuchi motors used in the first 1/32 Jaguar RTR models used in the racing sets. Hence the cutouts to clear the wide square magnets.
Joe, the motor inside the box may have helped to make the box rotate at 10000 RPM, but it would have left the car just sitting there... the motor goes IN the car.
IUsing that old motor was likely a way for Strombecker, now owned by the Dowst Manufacturing Company to get rid of the piles of those leftover motors inherited from the old Strombeck-Becker company. Since they likely sold only a few hundreds of those "around the pylon" cars, sold in plain-Jane brown cardboard boxes by the way, I think that the plan failed.