If its a Turbo 5.0 ... just use a PRO-M Bullet blow through calibrated for a turbo application.. they will send you the cal sheet...
then get a PMAS and that is all you will ever need. Stock like idle .. great driveability .. excellent response .
Get a used PMS with 3 bar map.. it has wideband input and boost retard all user settable ... you can configure the whole thing in an hour and be close ..
They go for $500 used all day long ...its the simplest cleanest way to run a Turbo 5.0 ... that setup has run Deep in the 8's with a simple stock ECM and PMS