Well, in the town that is home to the world's largest naval base (Norfolk) and perhaps the largest naval air station (Oceana), do you suppose I can find someone who stocks quarter-inch female spherical rod ends? Or even knows what I'm talking about? The answer to the first question -- after 5 days of searching -- is no. The answer to the second is "darn few".
So I've refurbished, re-installed and adjusted the stock linkage. Or, at least, the linkage that came with the car when I bought it equipped with the PI intake and Carter carb.
Now connected to the Holley, with the linkage rods fine-tuned (read: slightly bent to different shape) and adjustment pins tweaked, the set-up fully activates the carb to WOT, results in good pedal location and feel, and doesn't bind. Will get a new carb spring this coming weekend -- the grungy old one wasn't worthy of the photo op.