Two  cars on the SG+ chassis.

(T-Bird Ford Stock car #6, #8700)

(Nissan 300ZX #75, #8710)

22 Volt Power Pack.

17 Feet of Track

 

Catalog:  1990, 1991

 Also sold as a white box catalog item with #57 Nissan.  It is possible the regular set also had the #57 even though the box art shows the #75.