high altitude problems, need advice please!

Hey everyone-

I just moved from portland, or to Vail, CO. and I am having some issues with my 67! I burned out my transmission in Utah and had that rebuilt. When I started the car in Ogden, it ran like crap (I think because of the drastic altitude change between Ogden, UT and Portland ~5,000 ft, I think), so I adjusted the carb a little bit and it ran pretty good until I started climbing higher into Colorado. Once I got to Avon, CO (~7500 ft) the car was basically just crawling along even though I was flooring it all the way. No power, but I was still getting normal gas mileage. I am so confused at what I should be doing now to remedy that problem.

The car is a straight six 200ci, with a single barrel carb and a newly rebuilt c-4 transmission. I'm wondering if the carb just isn't getting enough air into the engine since it's such a high altitude. Any ideas? Any help would be immensely appreciated. I'm seriously at a loss. Thanks!

-jrm

thanks for the quick response! That makes sense. So if I adjsut it correctly, I should be able to drive rather normally shouldn't I? I mean, I can barely get up a very small hill right now. I jsut have to throw it in 1st and hope no one is coming up behind me too fast!

Is there anything else I can do to increase the performance... upgrade to a 2 barrel carb, soem kind of air intake system, any ideas? I honestly don't know that much about working under the hood, I'm still learning something new everyday, so excuse me if my assumptions are basic, elementary, and/or way off course!

Also, I can't find any accesible information for Pony Carb. I find a website, but it comes up "page not found"... any ideas how to get in touch with them?