There are various reasons why the linkage lost travel over time, but the easiest place to take up the slack is under the car on the left side of the transmission. Pop off the knuckle #6 from the ball of #12, loosen #5 and shorten the linkage until when you have full throttle stepped on all the way down, there's just a business card gap to the full throttle stop at the throttle body. #6 can be hard to pop off because there's a tiny retaining pin on the side if you clean it and look closely, so pop out the pin, or just use something like a 11mm open ended wrench under it and try to pop it off.
