I'm familiar with the 6,000 ft elevation at Colo Springs. Long duration cams and poor air quality wants to fatten up the engine mixture, especially at idle. And your poor vacuum at idles becomes worse once you put the car in gear. I don't claim to be a eddy specialist, but I feel I have more control with a Holley style carb. No, I'm not anti-eddy. I have 3 eddies in service right now on a couple of my classics.