I had the same end carbs and linkage on a '65 manifold with the '65 small center carb. It worked fine, idled fine for years.
Then I switched everything to a '66 manifold to accommodate the larger size 455 center carb base. That may have moved the center carb a tad bit further forward.
I don't know. There isn't much thread engagement remaining on the slotted link, it is almost all the way out.
It only idled high when the oil got fully up to temperature (It has a 8 qt Canton pan). Since I don't drive this car that much, I only noticed it in January this year after the car's first long drive. The idle problem was not the original reason for this thread.
There is a photo of my linkage on post #66.
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