By 1969, the growing segment of people who wanted big horsepower in their cars was too big to ignore, so Buick joined in a big way with the Grand Sport, or GS for short. This 1969 GS400 is a wonderfully sinister creation, looking quite stock on the outside, but packing a brutally fast 455-inch big block and a competition-quality stereo system, all wrapped in that plain black Buick wrapper. The GS really needs no introduction, as it eventually evolved into perhaps the nastiest machine on the street. The Buick''s calling card was, of course, an iron fist in a velvet glove and it combined luxury and performance better than just about anything else of the era. Dressing it in black is the perfect demonstration of that effect, giving it a subtle yet imposing stature that fits it like a tailored suit. The sheetmetal underneath is straight enough to use with black paint, and given the vast sums of cash spent on this hardtop, it shouldn''t be surprising. The stock hood remains, including its V-shaped "power dome" that still wears ''400'' badges to deceive the unwary (as if 400 cubic inches weren''t enough). A matching black vinyl top gives it a more formal air, and it seems right on a Buick, even one designed for wheel-to-wheel combat. Sparkling chrome, a super-straight grille, and bright stainless trim around the wheel arches add a bit of jewelry to the serious-looking Skylark. The white interior fits like a crisp tuxedo shirt on the black Buick and packs a lot of features you''d expect in a car like this. It''s surprisingly understated, not deviating much from the standard Skylark setup, and still includes a bench seat and column-shifted TH400 3-speed automatic. Perhaps the most notable features are the custom speaker enclosures built into the doors, neatly incorporating the power window switches so nobody''s inconvenienced by the upgrade. The gauges are all factory-issue and you didn''t get much, even in the high-end Buick, but a pair of auxiliary gauges under the dash have come to the rescue. Factory A/C was a big part of the GS''s appeal, and it''s been upgraded with Vintage Air components and R134a refrigerant, so it''s reliable and powerful today. A Pioneer AM/FM/CD/iPod head unit with Bluetooth connectivity is the heart of the audio system, and powers a custom speaker box neatly installed in the trunk. Although it looks pretty stock, the big block under the hood is a 455 cubic inch mill, professionally built and stuffed with all the good stuff. Aluminum heads and a matching intake were provided by Edelbrock, while a Holley carb delivers the fuel under that functional ram-air hood. Trick cast aluminum valve covers highlight that this is a Buick, and they took a few steps to keep it stock-looking under the hood, which is nice. Long-tube headers with 3-inch collectors feed a custom dual exhaust system and big sway bars have been installed front and rear. The original 12-bolt rear plants the power and the power brakes have been rebuilt to ensure safety with all that horsepower on tap. Classic Buick road wheels are still fitted, wrapped in 225/70/15 Firestone Firehawk radials. Beautifully built at a cost way over the asking price, this Buick does everything well. And, as a bonus, if you''re interested in the original, numbers-matching engine with just 40 miles on the rebuild, it''s available, too. Call today! This vehicle is located in our Dallas/Fort Worth showroom. For more information, please call (817) 764-8000 or toll free (855) 877-2707.