Will the dyno operator run your rig or does he let you run it on the dyno? You will want to do an accelerometer run that is what everyone here uses but its not the most accurate. On a mustang you can do true load tests to get the real power numbers but many will bock at that here because a dynojet dyno is the most popular accelerometer it gives inflated FUN #'s. If you are to run it take it to lockup in OD and get it to around 1800 and lay into it heavy but smooth to about 2k rpm then WOT,this is to prevent it from down shifting. until dyno guy gives thumbs up then let up. Do not let the dyno guy start you from a rolling start in first and read while it is upshifting it will give a real low reading.