You have 3 choices, Matt -

1. Move the connection at the throttle arm lower
2. Move the cable bracket at the carb forward
3. Get a cable with more travel*

* may require modifying pedal lever or mounting to use the travel

This assumes you have the Mopar throttle arm adapter, though my racecar doesn't use one, but that's a fabbed-up deal.
The amount of increased effort from #1 isn't much at all.