[Formulajones]

I typically don't have issues with the elevation and carbs. I've lived out here long enough that I've found a happy medium with fueling that works well at elevation yet doesn't get too lean near sea level. Usually that means letting it be a little rich up high and still safe down low and the plugs still stay clean enough. Each car is different and takes quite a bit of time to get it dialed in.
I did go EFI on the Chevelle a few years ago, primarily to experiment. It's nice to let closed loop comp make the necessary changes on the fly while driving from the mountains down to sea level and back. Dad did the same on the GTO and it's worked well on both cars.