The altitude means you'll need a leaner jet (because of the lower air density).

Is the engine all original or has somebody changed the carb to a later model? This was discussed about a month or so ago, but I believe the poster had a Carter carb. Jon (CarbKing) has jets in whatever size you need. I'd contact him. You might look inside your carb to see what jet is there first. Most of these I've seen lately have been 57 or 58 and one was a 59 size. In Taos you'll be getting only ethanol gas, yes? I know that's the case in Ruidoso. You may or may not need a slightly richer jet for that, so there will be a little see-saw thing there and Jon would be the ideal advisor...

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end