A fantastic fan request, thank you! Check out this BADASS 1969 Mercury Cyclone CobraJet 428!!!
Hagerty.com says that by 1969, the Mercury Cyclone formal hardtop had been canceled and the GT fastback was also available as a CJ model. That came with the 335-hp, 428-cid V-8 standard, a four-speed transmission, and a plain bench seat interior.
At $3,207, the CJ was aimed at the Plymouth Road Runner, and a 435-hp version could run 0-60 in 6.1 seconds with a quarter-mile time of 13.9 seconds.