From what I recall, the Chevys had 2 ratios available in T10s: 2.20 or 2.52 low gear, with a fairly wide 3/4 ratio split on the "wide-ratio". You could tell the 3/4 shift difference at the drag strip.
My '73 Z28 I ordered/bought new came with a Muncie, and though I can't recall a specific factory application of the Super T10, there had to be one or several, as I recall the various ratio sets as posted. At the time, 4-speeds were still the thing in drag racing (MP classes, etc).
Best use of a T10 ever was Ken Dondero driving Bob Panella's blown 301" little panel truck; best I've ever heard, no RPM flare, just beautiful.