search for a program that you can enter your know parameters that works for your car now. Maybe you can change the elevation and it will recommend a jet to run. That is what the motor leasing company would do on the stock cars I worked on. They had the conditions of the dyno room tune and would set up and get elevations, etc and rejet the motor for the race track conditions. (I don't know the program, it was back in 96) This might help
http://www.bgsoflex.com/holley.html
Guy