An IMSA GT race in the mid-1970s was a lot like a Halloween party.

The expected costumes were on display--BMW 3.0 CSLs, Chevy Monzas, Datsun 240Xs, Porsche 911s, Chevy Camaros, and on the fringes, the weird and wild brought the fun. IMSA’s visit to Road Atlanta in 1976 for its 100-mile sprint attracted rare birds like a Ford Mustang II Cobra, the widest Chevy Corvette C3 known to man, courtesy of the late and iconic John Greenwood, a Lotus Elan, Porsche 914/6s, a Pontiac Astre, De Tomaso Panteras and a Mangusta, plus a Ford Escort, Triumph TR6, and a wayward Alfa Romeo GTV.

Wielded by some of the greatest sports car drivers IMSA has produced, late heroes Al Holbert, Peter Gregg, and more were the subject of an awesomely narrated highlight reel from the April 11 event held 42 years ago. Thanks to YouTube, the American monsters and European challengers from this old school event will race on in perpetuity.

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