In mid-1968, Shelby American commissioned a new and improved version of the 428 V-8 utilizing components of the old 427 V-8 creating the legendary Cobra Jet engine. Conservatively rated at 360 horsepower, its actual output was closer to 400. This engine included a pair of 427 low-riser cylinder heads, a 735-cfm Holley carburetor and many subtle improvements. The resulting Cobra Jet was immediately recognized as a strong and reliable performer.

The 428 Super Cobra Jet (also known as the 428SCJ) used the same top end, pistons and engine block as the 428 Cobra Jet but the crankshaft, connecting rods, and associated balancing were different. A nodular iron crankshaft casting was used as well as heavier 427 "Le Mans" connecting rods with capscrews instead of bolts for greater durability. The heavier connecting rods and the removal of the center counterweight on the stock 428 Cobra Jet crankshaft , required an external weight on the snout of the crankshaft for balancing. An engine oil cooler was standard equipment with the 428 Super Cobra Jet (later referred to as "Drag Pack") and 3.9 or 4.3 rear end gear ratios. In addition, there was a difference between the CJ and SCJ 428 cast aluminum pistons. All of these changes to the engine components were made to provide greater reliability for engines expected to be raced and abused

Shelby ensured that the GT 500 retained its unique identity, and for 1969, it incorporated a longer fiberglass front end, a unique grille, a revised taillight and exhaust treatment, as well as an aggressive hood with five NACA-style air scoops. Inside, a roll bar, inertia-reel racing harnesses, luxurious features and special trim maintained the performance-oriented, limited-production character of the GT 500.

This SCJ GT500 is an extremely rare example, especially in Black Jade Metallic. It features the legendary SCJ engine, Cobra Jet Ram Air Induction, the Drag Pack option and a four-speed manual transmission with a Hurst shifter. It has a Deluxe AM/FM Stereo and has period correct Goodyear Polyglas GT tires (not pictured). It has been fully restored to M.C.A. and S.A.A.C. Gold Standards and is an incredible opportunity to own an automobile with outstanding performance and history to the same token.