2002 GT - Best Clutch / cable setup

I have weakness in my legs due to a disability, and as such, for a different reason am in the same boat as you. What you're describing is probably just the stock clutch... if you've never driven another stang, I can see where this would seem like a crazy stiff clutch. I installed my MM clutch quadrant and firewall adjuster primarily to help my left leg out, it doesn't decrease pedal effort, but does decrease the throw of the pedal (which you may have noticed is also quite high compared to other cars), and thus improves the geometry... it puts your leg in a more powerful position and essentially increases your mechanical advantage. Those two mods were enough to make it possible for me to drive without having to coax my leg with my hand. Also, you don't need to replace the cable, the Ford one is about the best you can get and works with aftermarket quadrants and firewall adjusters with minor modification.

At some point down the road I will be looking at upgrading my clutch to a twin-disc setup (unfortunately fairly expensive), something that has a little more clamping force than a stocker, but set up to be lighter than the stock clutch. Multi disc clutches have the advantage of being able to apply more force than single disc clutches with less effort by the clutch fork, so in theory you should be able to get one made or find one that will offer equal or less pedal effort for the same or greater than stock clamping force.

Of course, I could be wrong and you might not have a stock clutch... I'd say the pedal effort is about 45 lbs for my stocker, if I were to make a guess. I apologize in advance if I've simplified my post too much for you, not knowing how much you understand on the subject.