The travel of the valve should be 1.610” so I did the math. My throttle rotates 70degrees from idle to full open. Using this number I drew a picture. What this demonstrates is that a triangle can be drawn using the center of the throttle shaft as the starting point. Two lines that cross at that point at the proper degrees create side “A” and side “B”. Side “C” is the 1.610” travel for the valve movement. This gives a triangle where Side “A” = Side “B” and side “C” = 1.610 with angle “C” is 70 degrees. What this tells me is that length of side “A” and side “B” is equal to the radius of the circle that any point on that circle will move 1.610” when the throttle is moved from idle to full open. Now here comes the tricky part. The movement of the cable becomes a relationship between the point that it connects to the throttle plate and the bracket that holds the cable. If the center of the cable is mounted on the plane that is created by side ”C” it will see the most uniform movement that is possible. Any other position would throw off the alignment and cause for some readjusting. The other possible issue would be if someone made a change in the adjustment idle screw. This would change the angle of travel and again cause the need for the pressures to be rechecked.

http://i213.photobucket.com/albums/cc149/Redwingvette/OD%20Trans%20install/TVCablebracket.jpg