History might remember the first-generation, 1964-to-1966 model years, as the progenitors of the breed, but the second- and third-generation Mustangs are the ones most people remember most fondly. The 1967 model year was when the Mustang truly branched off from its economy-car roots to become its own entity, though a few of the drivetrain options did initially carry over.
There were three versions of the 289 Windsor in the 1967 Mustang. The two-barrel-carburetor, C-code 289 made 200 horsepower at 4,400 rpm and 282 foot-pounds of torque at 2,400. Next up the list was the A-code four-barrel engine, which made 225 horsepower at 4,800 rpm and 310 foot-pounds at 2,800. The Hi-Po K-code engine pumped out 271 horsepower at 6,000 and 312 foot-pounds of torque at 3,400 rpm. That was about one horsepower more than the two-barrel 390 big-block available in 1968, which added a pretty considerable 200 pounds of weight over the front axle.