[Tom Goldman]

Advantages to both, much depends on the type of throttle stop being used.
An inline throttle stop will work as well as any under carb stop when using a cable .
Most cars ,even with engine limiters still have too much engine movement to be precise
using an inline stop with a rod setup.
Biggest issue with a cable is space . The flimsy stock type or Lokar cables really aren't suited for the abuse of racing .
I've always used Morse cables on cars I've built that utilized a cable ,but they can be a bit of a space problem under the dash of some door cars, plus using an inline stop with a cable will almost always necessitate mounting the carb backwards.
With an under carb stop ,I would always build with rod linkage.