The HCS`s (High Country Special`s) were produced for 3 years in a row. 66, 67 and 68. There were only 251 68 models made and they looked exactly like the GT/CS`s except for the HCS badging and the DSO number has to be 51 for Denver. When you see that only 4118 GT/CS`s were made that includes the 251 HCS`S. The number of GT/CS`s is actually 3867 and they were only made for one year. The GT/CS`s and the HCS`S were produced with all the same engines that were available to regular Mustangs. The 200 inline 6 cylinder with a 1V carb, the 289 2V, 302 2V, 302 4V, 390 2V and 4V, and the 428 4V Cobra Jet. 68 Shelby ( which are also 1965 T-Bird) tail lights were added along with side scoops, Marchal or Lucas fog lights, blacked out grill, hood locks, hood blinker lights, GT/CS striping,the California Special script and the fiberglass trunk lid and quarter extensions. The HCS does`nt have the script, obviously. Interestingly enough, nowhere on these cars is the name Ford except for the name FoMoCo on many of the individual parts. I saw a story on tv when I was a kid about the California Special and I always knew that it was one of the most rare and sought after limited edition Mustangs. I always kept looking for them but had never seen one until the day a friend of mine said he had one fresh off a truck from Texas. I just happened to have $8000.00 cash in my pocket and I raced off and bought it on the spot. I`ve never had that much money before in my life. It was quite the coincidence that I would have the money and the opportunity at the same time in my life. That will never happen again I`m sure. I honestly knew pretty much nothing about these cars until I found this site. Buying my car and finding this site has been great for me body and soul. Driving my car with a manual trans and manual steering is always a workout for me since I am only 5 foot 1 inches tall. I have nerve damage in my left leg from a bad back and driving the car with the clutch is theraputic for me. Steering it actually helps me keep the strength in my arms. Anyway, the GT/CS and HCS stand out because they are so rare and desirable. The prices of these don`t reflect that yet, but it will I feel. Someday these cars will be worth as much as the Shelby`s. Some people tend to think that the ones with the big blocks are the ones that will be dictating those high prices, but I tend to disagree. I think eventually they will all be just as desirable and worth the investment.