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The GSX Prototype car is Apollo White. In 1970 you could only get a GSX in Apollo White or Saturn Yellow. 687 total made that year. 400 and some yellow cars and the rest were white. Of those 687 GSX cars, about 2/3 were Stage 1 455s and the the rest were standard 455 cars.

The GSX prototype car does have a different hood, rear wing and other small differences. The interior on the prototype car is very radical compared to production X cars.

Patrick