Lonnie,
I don't have this combo, but have worked on a members truck that had the Fentons, dual Rochesters AND the Hydra-Matic.
I rebuilt/installed the carburetor to tranny kickdown linkage. The linkage fit fine, but you had to be a chimp to get your hands into the space available to address the linkage at the bellcrank area...a true bi@#ch!
The linkage from bellcrank to carburetors looked like a pretzel and if you haven't selected your intake manifold yet, I would highly recommend the type with the cast in provisions for a throttle rod.
The funky Offy linkage has never worked and has never been improved. I did a 3X1 setup 30 years ago and it was the same dippy linkage...a skinny little rod with brazed on tabs.
If you have to access the linkage where it attaches to the block you will need tiny hands or long needle nose pliers, but once on, it works perfectly.
Stuart
