Will a throttle cable stretch over time?

67 Dart 273-2 married to a 904. Stock everything.

When I bottom out the pedal, I am only about 75% open, which is capping me out at about 65mph.

Investigating yesterday, it appears the throttle cable at some point was misrouted and was under great strain. We were able to re-route it to what I believe is correct, but am still unable to adjust to proper. I can either have about 85% pedal. Or, when we adjusted to get 100% pedal, then "something internal" would not close properly leaving a high idle (I am not a carb tech guy - so go easy on me).

My buddy says he thinks the cable stretched over time from being misrouted and under great strain. Searching threads here, I found nothing on stretched throttle cables. But at this point, we are not sure what else it could be.

Anyone with experience here who knows?

I will try to post pics today to see if anyone notices anything that is out of place.

Thank you