In HP Tuners the tables you will need are "MAP per Airmass (High Res)" and "MAP at Zero Airmass (High Res)". Do not use the other versions of these as they do not work and you will waste a lot of time trying to figure out what is wrong (been there done that)
As Jet said how you proceed depends on your knowledge. Toads mentioned that there is a Speed Density discussion on this forum but it is not all that helpful if you don't understand the basics. As he mentioned it is best to start off with the injector dynamics VE page:
http://wpdev.injectordynamics.com/ar.../shelby-gt500/
Look for the sexy maths teacher a fair way down (dated 8-12-2012):hi:
I was thinking of writing up a speed density one day detailing how it works and all the fun stuff you can get out of it (horsepower, Load, injector pulse widths/duty cycles, ...)
Darryl.