440 build help

Do you run at Bandimere? Just asking so guys can consider the "mile-high" part when guessing et's.
I live in South Jersey. I visited a friend in Colorado with my low 13 second Mustang. It ran 14.40's there! (I did baby it a bit, being 1800 miles from home.) It felt like it was running on 7 cylinders.
Nothing AT ALL WRONG with that! It was one of those, "that's different" experiences.
Your car's gonna run good. You might want to consider more compression because of the altitude, though. You probably know what it'll take to compensate for the altitude, since you live there. I know from my experience there, everyone has a different way of thinking.