1968 Ford Mustang 2+2 vintage ad. Hot Rod Magazine sees the light. The Cobra Jet will be the utter delight of every Ford lover and the bane of all the rest because, quite frankly, it is the fastest running Pure Stock. With the optional Cobra Jet 428 big bore block. Start with a police interceptor V8, add a high pressure oil pump, large diameter con-rod bolts, and you've got 335 hp at 5400 rpm with 440 lbs of torque. 0 - 60 in 5.9 seconds with a quarter mile time of 13.56 seconds at 106.64 mph.