You don't need to stack the SCT with anything...just get custom tunes for the SCT....
Hang on, didn't look close enough, you have an 00 with the 7.3? Dunno if you can use that combo on a 7.3, but as far as I know, you don't need to stack anything with a SCT.
Hopefully another 7.3 person will chime in with an exact answer for ya!