OK I would call that throttle actuator bellcrank affair on the engine as "not so simple"! In fact I have NEVER seen that on a Goose...... Similar in nature, not in execution, to the carb linkage found in 66-67 Fairlane/Comet to accommodate engine to firewall movement.....Rube Goldberg was definitely involved there.....
Since that carb appears to be an off the shelf Holley, and not an Autolite Ford unit......all bets are off!!! (I would have moved the cable bracket forward to the next or front most intake manifold bolt or made a new bracket to do so.)
In this case, I believe that the owner is concerned with replacing the sheathing and not the actual cable inside.....or perhaps both! So does the Pantera version offer a suitable replacement still?
I do agree that replacing the actual cable can be done in a variety of manners......bicycle brake/shifter cable etc. Multiple different diameters and flexibility characteristics as well........
Ciao!
Steve