**WTB 67 V8 throttle cable**
Haven't had to buy one lately....A guess...local parts emporium? 2bbl would be more available, I assume, as they are more common.
273 2 bbl is 2843745, 4bbl is 2843746, but they will swap. Like I say, I have 2bbl one on my 4bbl Dart right now.
I would think a 340 cable would work as well.
There are some on ebay, and several suppliers through Google.