Dang, Must be something with 66's LOL I share your pain, I had the same problem when I replaced my clutch last spring when I put my fresh motor in. I went from a 9 1/2" to a 10" clutch and nothing else changed. I replaced all the linkage and rebuilt the z bar. I also replaced the fork and pivot. I never did get it to work or adjust correctly. I ordered Brewers clutch kit, fork and pivot and had my local Clutchmasters check it out. It was set up perfectly and I hope when I install it (hopefully soon) I will be able to adjust it and it will work as designed. I wish I had an answer for you but I don't. Apparently the pressure plate is a different dimension than the stocker and the fingers are closer to the flywheel (just a guess) It appears like we need more stroke from the petal pivot because the adjusting rod doesn't help. If you adjust the petal for a couple inches of free play at the top it won't disengage when the petal is on the floor. If you adjust it so the clutch disengages 3/4 the way to the floor then the throw out bearing rides on the pressure plate fingers all the time and ruins the bearing. Keep in touch. We'll beat this thing yet! toolmanmike