https://www.conceptcarz.com/z25185/mercury-comet-cyclone-bfx.aspx
"The first batch of lightweight racing cars by Mercury was offered in 1964. They were race prepared from the get-go. Mercury produced around 11 A/FX cars in 1964, which went to famous race car drivers like Arnie Beswick, Eddie Shartman, and Dyno Don Nicholson among others. The B/FX Comets of 1965 were built off a 289 engine with 271 horsepower, and used four Webbers. Building up the 289, horsepower on these cars could approach 450. Since these cars weighed in at around 2,600 pounds, the performance was outstanding."