1966 2nd design - 1967 with 327 engine used an 19 1/4" clutch pedal push rod, & a 8 9/16" clutch fork push rod
1965-67 396 & 427 engines used an 19 1/4"" clutch pedal push rod, and a 8 9/16" clutch fork push rod
1968-81 all engines used an 16 3/8" clutch pedal push rod, and a 8 9/16" clutch fork push rod