1970 Shelby GT-500 Muscle Machines review. Classic Game Room presents a CGR Garage review of the 1970 SHELBY GT-500 Muscle Machines car with dark blue paint and a white racing stripe with gobs of chrome and a mammoth engine sticking out of the hood. CGR 1970 Shelby GT 500 Muscle Machines video review features the '70 Shelby GT500 in blue with exaggerated proportions, rubber tires, chrome wheels and tinted windows.