[Dick Boneske]

I've noticed that the slotted linkage rods for various Tripower linkages have several different part numbers--having to do with the length of the slot. It puzzles me, however, that the slot is too short in your setup. The geometry of the center carb throttle lever, I thought, was the same from 1961 until into the 1970's.

I was surprised that you overlooked interference from the slotted rod as the cause of your high idle. I guess that explains the problem, though. Center carb throttle plates without holes would not have been needed. I would be interested to see some pictures of the installed linkage. Something does not add up.