The factory throttle cable is available from different sources... An E-body uses the same cable.

http://cgi.ebay.com/ebaymotors/NEW-71-74...=item3a6645764d

From what I see the kick-down plate(slotted) is touching the wrong end of the carb stud. It should be on the back-end that way when you give it gas it starts to put pressure on the tranny throttle valve right away. so even with the correct stud the tranny kick-down won't work right. need to adjust rod out or replace it with a longer one. I probably have it but seeing you need it now...