It shared more than its looks with the Porsche. The car has a steel tube chassis and mid-engine layout with an aluminum body, and is said to have raced with a 4-cam Porsche motor. . In the 2004 book, Vintage American Road Racing Cars, Mong was quoted as saying he built the car because of “...the inability to buy a Porsche,” and “I realized
you could switch the ring and pinion and run the thing like a 550 Spyder”.
Here's a shot of the car on the trailer Mong built for it, another shot with second owner Floyd Sable, and an ad Sable placed in Car and Driver in 1964.