Here is an adjustable linkage with a swivel head from The Truck Shop. Page 84, bottom right corner. May still be too short(?) I have seen similar rods from other suppliers, possibly longer than the ones from the Truck Shop.

FWIW, my '54 rod is too short when I use a carb insulator plus 1/16" gaskets on top and bottom. I run with insulator only -- no gaskets.

- Lonnie
My '54 3104
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post.
lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt.

OLD STUFF ... houses, furniture, cars, wine ... I love it all