440 build help

ya kinda sucks this high up but im in pueblo mostly racing there at 4700 above sea level..but ya to get where i want here it takes alot more hp/money lol thats why i was shooting for a realistic goal of in 12s here so when i go to great bend, ks ill be in 11s lol im glad you have experienced the mile high it shows and feels like 2 diff cars.