Yes, there is a 4V throttle bracket. There is also a 4V throttle cable. You need both. Best bet is to find a junkyard cop car or parts on eBay, etc., but they may still be available from the dealer for an AHB (cop) application with the 4V carb. The QuadraJet parts work perfectly with the ThermoQuad.
Heed 72Dodge's advice and get an FSM. The stuff you find useful in the aftermarket manuals will look ridiculous in comparison with the real deal... oh, and stop poking around trying to improve on the article. Follow it to the letter regarding the wiring and you'll have no issues. The last guy I knew that had both the article and the FSM tried to do it his way, didn't know where he screwed up, and was too far away for me to look at the car personally. After getting him to undo everything he'd done and start over, he still couldn't make it work and had obviously fried or miswired something somewhere (I still think he reversed the start & run wires at the ballast). He eventually sold the car out of frustration. Suffice to say, attempting to improve upon or streamline a proven process usually results in failure.