Marv,
I completely agree with your statement about the fact that all '67 K-Codes had to have the GT Equipment Group option. However, I question the accuracy of your next statement that "All the GTs used the Competition Handling Package". Perhaps you meant to say "All the GTs used the SPECIAL handling package". If you didn't, here is the reason why I am questioning your later statement. I presently own two '67 K-code fastback 4 speed cars. One is a Detroit car built on March 22, 1967; the other a San Jose car built on May 1,1967. Here are the options that each car came from the factory with per each car's Marti Report. The Detroit car's option list is as follows: 1) GT Equipment Group, 2) Four-Speed Manual Trans, 3) F70-14 Wide Oval Tires, 4) White Sidewall Nylon Tires and 5) AM Radio. The San Jose car's option list is as follows: 1) Extra Cooling Package, 2) GT Equipment Group, 3) Four-Speed Trans, 4) Courtesy Light Group, 5) 6.70x15-4Ply Rated 170MPH Tires, 6) Black Sidewall Tires, 7) Sport Deck Rear Seat, 
AM Radio, 9) Deluxe Seat Belts, 10) Shoulder Harness, 11) Heavy Duty Battery, 12) Competition Suspension.
To date, I have not been able to find anyone that can, with 100% certainty, tell me exactly what the Competition Suspension consisted of. One printed source that I have found "Illustrated High Performance Mustang Buyer's Guide" by Peter C. Sessler does address the competition handling package. Mr Sessler wrote, "For the serious enthusiast, a Competition Handling Package was available at a cost of $388.53. The cost limited the popularity of this option as it was only available with the GT package. It included stiffened springs, Gabriel Adjustable Shocks, quick-ratio steering, 15/16" front sway bar, limited-slip axle with a minimum 3.25 ratio, and 15" steel wheels with wire wheel covers." Now, do I believe this as 100% gospel? In one word, NO, because in my humble opinon, the GT Equipment group already included the quick-ratio steering and 15/16" front sway bar. If I am incorrect on any of this please let me know; I am, after all, looking for the correct details so I can restore my car correctly.
I welcome and invite all informative discussion related to any of the option items that my San Jose car came with from the factory. If you have information, but for some reason do not feel comfortable positng, please send me a private message via this forum.
Qball, sorry if I hijacked your thread. I'm assuming though, since you are asking about the competition suspension, that you may have a '67 K-Code with this option as well; if you do, we need to talk.
Tom
