The letter “X” is one that became a signature in the world of Buick performance, but nearly 20 years before Buick’s hopped-up G-body proved macho enough to wear the legendary “X” logo, it was the company’s A-body fleet of the early 1970s that made Buick grunt into a General Motors reality. Of the few GSX’s built by Buick, only 400 cars were ordered with the “Stage I” powertrain upgrade.

Our featured A-body eBay find, a 1970 GSX Stage I, is car number 622 of 678 units that were built for the sales year. It’s enjoyed a rotisserie resto by the folks over at Red Hills Rod & Choppers of Saint George, Utah, and it’s one of 120 cars to be ordered with a factory 4-speed.

The car-loving geniuses over at Red Hills Rod & Choppers have not spared even one detail in the rebuild of this Buick, and the car still has intact the 425-horse, 455 mill that was the most powerful in its class. Not only this, but with an awe-inspiring torque rating of 510 feet-pounds of twist, Buick’s 455 also was one of the first big-cube V-8s to use thinned wall castings, making it physically lighter than Chevy’s 454 of the same era.

Making sure that everything on the race-ordered Buick was done correctly, the Saint George resto shop responsible for the Stage I’s resurrection even took care to make sure that the car’s original stripes matched the rear spoiler as accurately as possible. The GSX’s all-black interior has been maintained, and this, with an original 4-speed is reminiscent of the horsepower heritage behind Buick’s “X” factor.

While it’s true that $160k is steep for our clean GSX from Utah, it is an era-correct sled that has all of the right options. Even though this is the case, is the asking price for this Buick muscle classic worth it to you?