There was a member on the old FE Forum who took the time to make up some nice notated pictures with the differences in the ‘65 & ‘66 rear suspension, and the ‘65 & ‘66 clutch linkages ( if my memory is correct ), and he may have even documented more. Unfortunately I don’t remember his screen name right now, maybe someone here remembers. I’ll try to look later tonight if I printed out any of his posts. If you have access to the new Tap-a-talk version of that forum ( and it cooperates ) you might be able to find his old posts.